diff --git a/plugins/python-build/share/python-build/2.7-dev b/plugins/python-build/share/python-build/2.7-dev
index a97818ed..2edd8d90 100644
--- a/plugins/python-build/share/python-build/2.7-dev
+++ b/plugins/python-build/share/python-build/2.7-dev
@@ -1,4 +1,6 @@
-prefer_openssl11
+export PYTHON_BUILD_HOMEBREW_OPENSSL_FORMULA="${PYTHON_BUILD_HOMEBREW_OPENSSL_FORMULA:-openssl@1.1 openssl@1.0}"
+export PYTHON_BUILD_MACPORTS_OPENSSL_FORMULA="${PYTHON_BUILD_MACPORTS_OPENSSL_FORMULA:-openssl11 openssl10}"
+export PYTHON_CFLAGS="${PYTHON_CFLAGS:+$PYTHON_CFLAGS }-std=c99"
 install_package "openssl-1.1.0j" "https://www.openssl.org/source/old/1.1.0/openssl-1.1.0j.tar.gz#31bec6c203ce1a8e93d5994f4ed304c63ccf07676118b6634edded12ad1b3246" mac_openssl --if has_broken_mac_openssl
 install_package "readline-8.0" "https://ftpmirror.gnu.org/readline/readline-8.0.tar.gz#e339f51971478d369f8a053a330a190781acb9864cf4c541060f12078948e461" mac_readline --if has_broken_mac_readline
 install_git "Python-2.7-dev" "https://github.com/python/cpython" "2.7" standard verify_py27 copy_python_gdb ensurepip
diff --git a/plugins/python-build/share/python-build/2.7.0 b/plugins/python-build/share/python-build/2.7.0
index a7ca8052..c20c1c17 100644
--- a/plugins/python-build/share/python-build/2.7.0
+++ b/plugins/python-build/share/python-build/2.7.0
@@ -1,3 +1,4 @@
+export PYTHON_CFLAGS="${PYTHON_CFLAGS:+$PYTHON_CFLAGS }-std=c99"
 install_package "openssl-1.0.2k" "https://www.openssl.org/source/old/1.0.2/openssl-1.0.2k.tar.gz#6b3977c61f2aedf0f96367dcfb5c6e578cf37e7b8d913b4ecb6643c3cb88d8c0" mac_openssl --if has_broken_mac_openssl
 install_package "readline-8.0" "https://ftpmirror.gnu.org/readline/readline-8.0.tar.gz#e339f51971478d369f8a053a330a190781acb9864cf4c541060f12078948e461" mac_readline --if has_broken_mac_readline
 install_package "Python-2.7" "https://www.python.org/ftp/python/2.7/Python-2.7.tgz#5670dd6c0c93b0b529781d070852f7b51ce6855615b16afcd318341af2910fb5" standard verify_py27 copy_python_gdb ensurepip
diff --git a/plugins/python-build/share/python-build/2.7.1 b/plugins/python-build/share/python-build/2.7.1
index aa1de984..745371fc 100644
--- a/plugins/python-build/share/python-build/2.7.1
+++ b/plugins/python-build/share/python-build/2.7.1
@@ -1,3 +1,4 @@
+export PYTHON_CFLAGS="${PYTHON_CFLAGS:+$PYTHON_CFLAGS }-std=c99"
 install_package "openssl-1.0.2k" "https://www.openssl.org/source/old/1.0.2/openssl-1.0.2k.tar.gz#6b3977c61f2aedf0f96367dcfb5c6e578cf37e7b8d913b4ecb6643c3cb88d8c0" mac_openssl --if has_broken_mac_openssl
 install_package "readline-8.0" "https://ftpmirror.gnu.org/readline/readline-8.0.tar.gz#e339f51971478d369f8a053a330a190781acb9864cf4c541060f12078948e461" mac_readline --if has_broken_mac_readline
 install_package "Python-2.7.1" "https://www.python.org/ftp/python/2.7.1/Python-2.7.1.tgz#ca13e7b1860821494f70de017202283ad73b1fb7bd88586401c54ef958226ec8" standard verify_py27 copy_python_gdb ensurepip
diff --git a/plugins/python-build/share/python-build/2.7.10 b/plugins/python-build/share/python-build/2.7.10
index c6eb3de6..3e4a411c 100644
--- a/plugins/python-build/share/python-build/2.7.10
+++ b/plugins/python-build/share/python-build/2.7.10
@@ -1,3 +1,4 @@
+export PYTHON_CFLAGS="${PYTHON_CFLAGS:+$PYTHON_CFLAGS }-std=c99"
 install_package "openssl-1.0.2k" "https://www.openssl.org/source/old/1.0.2/openssl-1.0.2k.tar.gz#6b3977c61f2aedf0f96367dcfb5c6e578cf37e7b8d913b4ecb6643c3cb88d8c0" mac_openssl --if has_broken_mac_openssl
 install_package "readline-8.0" "https://ftpmirror.gnu.org/readline/readline-8.0.tar.gz#e339f51971478d369f8a053a330a190781acb9864cf4c541060f12078948e461" mac_readline --if has_broken_mac_readline
 if has_tar_xz_support; then
diff --git a/plugins/python-build/share/python-build/2.7.11 b/plugins/python-build/share/python-build/2.7.11
index f07099b5..666379c4 100644
--- a/plugins/python-build/share/python-build/2.7.11
+++ b/plugins/python-build/share/python-build/2.7.11
@@ -1,3 +1,4 @@
+export PYTHON_CFLAGS="${PYTHON_CFLAGS:+$PYTHON_CFLAGS }-std=c99"
 install_package "openssl-1.0.2k" "https://www.openssl.org/source/old/1.0.2/openssl-1.0.2k.tar.gz#6b3977c61f2aedf0f96367dcfb5c6e578cf37e7b8d913b4ecb6643c3cb88d8c0" mac_openssl --if has_broken_mac_openssl
 install_package "readline-8.0" "https://ftpmirror.gnu.org/readline/readline-8.0.tar.gz#e339f51971478d369f8a053a330a190781acb9864cf4c541060f12078948e461" mac_readline --if has_broken_mac_readline
 if has_tar_xz_support; then
diff --git a/plugins/python-build/share/python-build/2.7.12 b/plugins/python-build/share/python-build/2.7.12
index 8fc9aed5..d66a7aa6 100644
--- a/plugins/python-build/share/python-build/2.7.12
+++ b/plugins/python-build/share/python-build/2.7.12
@@ -1,3 +1,4 @@
+export PYTHON_CFLAGS="${PYTHON_CFLAGS:+$PYTHON_CFLAGS }-std=c99"
 install_package "openssl-1.0.2k" "https://www.openssl.org/source/old/1.0.2/openssl-1.0.2k.tar.gz#6b3977c61f2aedf0f96367dcfb5c6e578cf37e7b8d913b4ecb6643c3cb88d8c0" mac_openssl --if has_broken_mac_openssl
 install_package "readline-8.0" "https://ftpmirror.gnu.org/readline/readline-8.0.tar.gz#e339f51971478d369f8a053a330a190781acb9864cf4c541060f12078948e461" mac_readline --if has_broken_mac_readline
 if has_tar_xz_support; then
diff --git a/plugins/python-build/share/python-build/2.7.13 b/plugins/python-build/share/python-build/2.7.13
index fb455431..22ac90ea 100644
--- a/plugins/python-build/share/python-build/2.7.13
+++ b/plugins/python-build/share/python-build/2.7.13
@@ -1,3 +1,4 @@
+export PYTHON_CFLAGS="${PYTHON_CFLAGS:+$PYTHON_CFLAGS }-std=c99"
 install_package "openssl-1.0.2k" "https://www.openssl.org/source/old/1.0.2/openssl-1.0.2k.tar.gz#6b3977c61f2aedf0f96367dcfb5c6e578cf37e7b8d913b4ecb6643c3cb88d8c0" mac_openssl --if has_broken_mac_openssl
 install_package "readline-8.0" "https://ftpmirror.gnu.org/readline/readline-8.0.tar.gz#e339f51971478d369f8a053a330a190781acb9864cf4c541060f12078948e461" mac_readline --if has_broken_mac_readline
 if has_tar_xz_support; then
diff --git a/plugins/python-build/share/python-build/2.7.14 b/plugins/python-build/share/python-build/2.7.14
index 52e85da9..9ca30a3a 100644
--- a/plugins/python-build/share/python-build/2.7.14
+++ b/plugins/python-build/share/python-build/2.7.14
@@ -1,4 +1,6 @@
-prefer_openssl11
+export PYTHON_BUILD_HOMEBREW_OPENSSL_FORMULA="${PYTHON_BUILD_HOMEBREW_OPENSSL_FORMULA:-openssl@1.1 openssl@1.0}"
+export PYTHON_BUILD_MACPORTS_OPENSSL_FORMULA="${PYTHON_BUILD_MACPORTS_OPENSSL_FORMULA:-openssl11 openssl10}"
+export PYTHON_CFLAGS="${PYTHON_CFLAGS:+$PYTHON_CFLAGS }-std=c99"
 install_package "openssl-1.1.0j" "https://www.openssl.org/source/old/1.1.0/openssl-1.1.0j.tar.gz#31bec6c203ce1a8e93d5994f4ed304c63ccf07676118b6634edded12ad1b3246" mac_openssl --if has_broken_mac_openssl
 install_package "readline-8.0" "https://ftpmirror.gnu.org/readline/readline-8.0.tar.gz#e339f51971478d369f8a053a330a190781acb9864cf4c541060f12078948e461" mac_readline --if has_broken_mac_readline
 if has_tar_xz_support; then
diff --git a/plugins/python-build/share/python-build/2.7.15 b/plugins/python-build/share/python-build/2.7.15
index 1cd5e5e5..71d13d60 100644
--- a/plugins/python-build/share/python-build/2.7.15
+++ b/plugins/python-build/share/python-build/2.7.15
@@ -1,4 +1,6 @@
-prefer_openssl11
+export PYTHON_BUILD_HOMEBREW_OPENSSL_FORMULA="${PYTHON_BUILD_HOMEBREW_OPENSSL_FORMULA:-openssl@1.1 openssl@1.0}"
+export PYTHON_BUILD_MACPORTS_OPENSSL_FORMULA="${PYTHON_BUILD_MACPORTS_OPENSSL_FORMULA:-openssl11 openssl10}"
+export PYTHON_CFLAGS="${PYTHON_CFLAGS:+$PYTHON_CFLAGS }-std=c99"
 install_package "openssl-1.1.0j" "https://www.openssl.org/source/old/1.1.0/openssl-1.1.0j.tar.gz#31bec6c203ce1a8e93d5994f4ed304c63ccf07676118b6634edded12ad1b3246" mac_openssl --if has_broken_mac_openssl
 install_package "readline-8.0" "https://ftpmirror.gnu.org/readline/readline-8.0.tar.gz#e339f51971478d369f8a053a330a190781acb9864cf4c541060f12078948e461" mac_readline --if has_broken_mac_readline
 if has_tar_xz_support; then
diff --git a/plugins/python-build/share/python-build/2.7.16 b/plugins/python-build/share/python-build/2.7.16
index 78c4785a..691f46ed 100644
--- a/plugins/python-build/share/python-build/2.7.16
+++ b/plugins/python-build/share/python-build/2.7.16
@@ -1,3 +1,6 @@
+export PYTHON_BUILD_HOMEBREW_OPENSSL_FORMULA="${PYTHON_BUILD_HOMEBREW_OPENSSL_FORMULA:-openssl@1.1 openssl@1.0}"
+export PYTHON_BUILD_MACPORTS_OPENSSL_FORMULA="${PYTHON_BUILD_MACPORTS_OPENSSL_FORMULA:-openssl11 openssl10}"
+export PYTHON_CFLAGS="${PYTHON_CFLAGS:+$PYTHON_CFLAGS }-std=c99"
 install_package "openssl-1.0.2q" "https://www.openssl.org/source/old/1.0.2/openssl-1.0.2q.tar.gz#5744cfcbcec2b1b48629f7354203bc1e5e9b5466998bbccc5b5fcde3b18eb684" mac_openssl --if has_broken_mac_openssl
 install_package "readline-8.0" "https://ftpmirror.gnu.org/readline/readline-8.0.tar.gz#e339f51971478d369f8a053a330a190781acb9864cf4c541060f12078948e461" mac_readline --if has_broken_mac_readline
 if has_tar_xz_support; then
diff --git a/plugins/python-build/share/python-build/2.7.17 b/plugins/python-build/share/python-build/2.7.17
index f8b06417..67b01935 100644
--- a/plugins/python-build/share/python-build/2.7.17
+++ b/plugins/python-build/share/python-build/2.7.17
@@ -1,3 +1,6 @@
+export PYTHON_BUILD_HOMEBREW_OPENSSL_FORMULA="${PYTHON_BUILD_HOMEBREW_OPENSSL_FORMULA:-openssl@1.1 openssl@1.0}"
+export PYTHON_BUILD_MACPORTS_OPENSSL_FORMULA="${PYTHON_BUILD_MACPORTS_OPENSSL_FORMULA:-openssl11 openssl10}"
+export PYTHON_CFLAGS="${PYTHON_CFLAGS:+$PYTHON_CFLAGS }-std=c99"
 install_package "openssl-1.0.2q" "https://www.openssl.org/source/old/1.0.2/openssl-1.0.2q.tar.gz#5744cfcbcec2b1b48629f7354203bc1e5e9b5466998bbccc5b5fcde3b18eb684" mac_openssl --if has_broken_mac_openssl
 install_package "readline-8.0" "https://ftpmirror.gnu.org/readline/readline-8.0.tar.gz#e339f51971478d369f8a053a330a190781acb9864cf4c541060f12078948e461" mac_readline --if has_broken_mac_readline
 if has_tar_xz_support; then
diff --git a/plugins/python-build/share/python-build/2.7.18 b/plugins/python-build/share/python-build/2.7.18
index 6576ca67..9ea67421 100644
--- a/plugins/python-build/share/python-build/2.7.18
+++ b/plugins/python-build/share/python-build/2.7.18
@@ -1,4 +1,6 @@
-export PYTHON_BUILD_HOMEBREW_OPENSSL_FORMULA="openssl@1.1 openssl@1.0 openssl"
+export PYTHON_BUILD_HOMEBREW_OPENSSL_FORMULA="${PYTHON_BUILD_HOMEBREW_OPENSSL_FORMULA:-openssl@1.1 openssl@1.0}"
+export PYTHON_BUILD_MACPORTS_OPENSSL_FORMULA="${PYTHON_BUILD_MACPORTS_OPENSSL_FORMULA:-openssl11 openssl10}"
+export PYTHON_CFLAGS="${PYTHON_CFLAGS:+$PYTHON_CFLAGS }-std=c99"
 install_package "openssl-1.1.1v" "https://www.openssl.org/source/openssl-1.1.1v.tar.gz" mac_openssl --if has_broken_mac_openssl
 install_package "readline-8.0" "https://ftpmirror.gnu.org/readline/readline-8.0.tar.gz#e339f51971478d369f8a053a330a190781acb9864cf4c541060f12078948e461" mac_readline --if has_broken_mac_readline
 if has_tar_xz_support; then
diff --git a/plugins/python-build/share/python-build/2.7.2 b/plugins/python-build/share/python-build/2.7.2
index 5620d4d7..60a07e08 100644
--- a/plugins/python-build/share/python-build/2.7.2
+++ b/plugins/python-build/share/python-build/2.7.2
@@ -1,3 +1,4 @@
+export PYTHON_CFLAGS="${PYTHON_CFLAGS:+$PYTHON_CFLAGS }-std=c99"
 install_package "openssl-1.0.2k" "https://www.openssl.org/source/old/1.0.2/openssl-1.0.2k.tar.gz#6b3977c61f2aedf0f96367dcfb5c6e578cf37e7b8d913b4ecb6643c3cb88d8c0" mac_openssl --if has_broken_mac_openssl
 install_package "readline-8.0" "https://ftpmirror.gnu.org/readline/readline-8.0.tar.gz#e339f51971478d369f8a053a330a190781acb9864cf4c541060f12078948e461" mac_readline --if has_broken_mac_readline
 install_package "Python-2.7.2" "https://www.python.org/ftp/python/2.7.2/Python-2.7.2.tgz#1d54b7096c17902c3f40ffce7e5b84e0072d0144024184fff184a84d563abbb3" standard verify_py27 copy_python_gdb ensurepip
diff --git a/plugins/python-build/share/python-build/2.7.3 b/plugins/python-build/share/python-build/2.7.3
index c158ee67..7335cbf8 100644
--- a/plugins/python-build/share/python-build/2.7.3
+++ b/plugins/python-build/share/python-build/2.7.3
@@ -1,3 +1,4 @@
+export PYTHON_CFLAGS="${PYTHON_CFLAGS:+$PYTHON_CFLAGS }-std=c99"
 install_package "openssl-1.0.2k" "https://www.openssl.org/source/old/1.0.2/openssl-1.0.2k.tar.gz#6b3977c61f2aedf0f96367dcfb5c6e578cf37e7b8d913b4ecb6643c3cb88d8c0" mac_openssl --if has_broken_mac_openssl
 install_package "readline-8.0" "https://ftpmirror.gnu.org/readline/readline-8.0.tar.gz#e339f51971478d369f8a053a330a190781acb9864cf4c541060f12078948e461" mac_readline --if has_broken_mac_readline
 install_package "Python-2.7.3" "https://www.python.org/ftp/python/2.7.3/Python-2.7.3.tgz#d4c20f2b5faf95999fd5fecb3f7d32071b0820516224a6d2b72932ab47a1cb8e" standard verify_py27 copy_python_gdb ensurepip
diff --git a/plugins/python-build/share/python-build/2.7.4 b/plugins/python-build/share/python-build/2.7.4
index 698898d2..93e2cf3a 100644
--- a/plugins/python-build/share/python-build/2.7.4
+++ b/plugins/python-build/share/python-build/2.7.4
@@ -1,3 +1,4 @@
+export PYTHON_CFLAGS="${PYTHON_CFLAGS:+$PYTHON_CFLAGS }-std=c99"
 install_package "openssl-1.0.2k" "https://www.openssl.org/source/old/1.0.2/openssl-1.0.2k.tar.gz#6b3977c61f2aedf0f96367dcfb5c6e578cf37e7b8d913b4ecb6643c3cb88d8c0" mac_openssl --if has_broken_mac_openssl
 install_package "readline-8.0" "https://ftpmirror.gnu.org/readline/readline-8.0.tar.gz#e339f51971478d369f8a053a330a190781acb9864cf4c541060f12078948e461" mac_readline --if has_broken_mac_readline
 install_package "Python-2.7.4" "https://www.python.org/ftp/python/2.7.4/Python-2.7.4.tgz#98c5eb9c8e65effcc0122112ba17a0bce880aa23ecb560af56b55eb55632b81a" standard verify_py27 copy_python_gdb ensurepip
diff --git a/plugins/python-build/share/python-build/2.7.5 b/plugins/python-build/share/python-build/2.7.5
index 4c195479..5f3a2a15 100644
--- a/plugins/python-build/share/python-build/2.7.5
+++ b/plugins/python-build/share/python-build/2.7.5
@@ -1,3 +1,4 @@
+export PYTHON_CFLAGS="${PYTHON_CFLAGS:+$PYTHON_CFLAGS }-std=c99"
 install_package "openssl-1.0.2k" "https://www.openssl.org/source/old/1.0.2/openssl-1.0.2k.tar.gz#6b3977c61f2aedf0f96367dcfb5c6e578cf37e7b8d913b4ecb6643c3cb88d8c0" mac_openssl --if has_broken_mac_openssl
 install_package "readline-8.0" "https://ftpmirror.gnu.org/readline/readline-8.0.tar.gz#e339f51971478d369f8a053a330a190781acb9864cf4c541060f12078948e461" mac_readline --if has_broken_mac_readline
 install_package "Python-2.7.5" "https://www.python.org/ftp/python/2.7.5/Python-2.7.5.tgz#8e1b5fa87b91835afb376a9c0d319d41feca07ffebc0288d97ab08d64f48afbf" standard verify_py27 copy_python_gdb ensurepip
diff --git a/plugins/python-build/share/python-build/2.7.6 b/plugins/python-build/share/python-build/2.7.6
index 76bb5730..2bef27f2 100644
--- a/plugins/python-build/share/python-build/2.7.6
+++ b/plugins/python-build/share/python-build/2.7.6
@@ -1,3 +1,4 @@
+export PYTHON_CFLAGS="${PYTHON_CFLAGS:+$PYTHON_CFLAGS }-std=c99"
 install_package "openssl-1.0.2k" "https://www.openssl.org/source/old/1.0.2/openssl-1.0.2k.tar.gz#6b3977c61f2aedf0f96367dcfb5c6e578cf37e7b8d913b4ecb6643c3cb88d8c0" mac_openssl --if has_broken_mac_openssl
 install_package "readline-8.0" "https://ftpmirror.gnu.org/readline/readline-8.0.tar.gz#e339f51971478d369f8a053a330a190781acb9864cf4c541060f12078948e461" mac_readline --if has_broken_mac_readline
 install_package "Python-2.7.6" "https://www.python.org/ftp/python/2.7.6/Python-2.7.6.tgz#99c6860b70977befa1590029fae092ddb18db1d69ae67e8b9385b66ed104ba58" standard verify_py27 copy_python_gdb ensurepip
diff --git a/plugins/python-build/share/python-build/2.7.7 b/plugins/python-build/share/python-build/2.7.7
index 337ba8d9..b1f1a027 100644
--- a/plugins/python-build/share/python-build/2.7.7
+++ b/plugins/python-build/share/python-build/2.7.7
@@ -1,3 +1,4 @@
+export PYTHON_CFLAGS="${PYTHON_CFLAGS:+$PYTHON_CFLAGS }-std=c99"
 install_package "openssl-1.0.2k" "https://www.openssl.org/source/old/1.0.2/openssl-1.0.2k.tar.gz#6b3977c61f2aedf0f96367dcfb5c6e578cf37e7b8d913b4ecb6643c3cb88d8c0" mac_openssl --if has_broken_mac_openssl
 install_package "readline-8.0" "https://ftpmirror.gnu.org/readline/readline-8.0.tar.gz#e339f51971478d369f8a053a330a190781acb9864cf4c541060f12078948e461" mac_readline --if has_broken_mac_readline
 if has_tar_xz_support; then
diff --git a/plugins/python-build/share/python-build/2.7.8 b/plugins/python-build/share/python-build/2.7.8
index 7d759800..9e30996f 100644
--- a/plugins/python-build/share/python-build/2.7.8
+++ b/plugins/python-build/share/python-build/2.7.8
@@ -1,3 +1,4 @@
+export PYTHON_CFLAGS="${PYTHON_CFLAGS:+$PYTHON_CFLAGS }-std=c99"
 install_package "openssl-1.0.2k" "https://www.openssl.org/source/old/1.0.2/openssl-1.0.2k.tar.gz#6b3977c61f2aedf0f96367dcfb5c6e578cf37e7b8d913b4ecb6643c3cb88d8c0" mac_openssl --if has_broken_mac_openssl
 install_package "readline-8.0" "https://ftpmirror.gnu.org/readline/readline-8.0.tar.gz#e339f51971478d369f8a053a330a190781acb9864cf4c541060f12078948e461" mac_readline --if has_broken_mac_readline
 if has_tar_xz_support; then
diff --git a/plugins/python-build/share/python-build/2.7.9 b/plugins/python-build/share/python-build/2.7.9
index 2ba752ff..0bbea6c4 100644
--- a/plugins/python-build/share/python-build/2.7.9
+++ b/plugins/python-build/share/python-build/2.7.9
@@ -1,3 +1,4 @@
+export PYTHON_CFLAGS="${PYTHON_CFLAGS:+$PYTHON_CFLAGS }-std=c99"
 install_package "openssl-1.0.2k" "https://www.openssl.org/source/old/1.0.2/openssl-1.0.2k.tar.gz#6b3977c61f2aedf0f96367dcfb5c6e578cf37e7b8d913b4ecb6643c3cb88d8c0" mac_openssl --if has_broken_mac_openssl
 install_package "readline-8.0" "https://ftpmirror.gnu.org/readline/readline-8.0.tar.gz#e339f51971478d369f8a053a330a190781acb9864cf4c541060f12078948e461" mac_readline --if has_broken_mac_readline
 if has_tar_xz_support; then
diff --git a/plugins/python-build/share/python-build/3.4-dev b/plugins/python-build/share/python-build/3.4-dev
index 1965cc26..d8869031 100644
--- a/plugins/python-build/share/python-build/3.4-dev
+++ b/plugins/python-build/share/python-build/3.4-dev
@@ -1,4 +1,5 @@
 prefer_openssl11
+export PYTHON_CFLAGS="${PYTHON_CFLAGS:+$PYTHON_CFLAGS }-std=c99"
 install_package "openssl-1.1.0j" "https://www.openssl.org/source/old/1.1.0/openssl-1.1.0j.tar.gz#31bec6c203ce1a8e93d5994f4ed304c63ccf07676118b6634edded12ad1b3246" mac_openssl --if has_broken_mac_openssl
 install_package "readline-8.0" "https://ftpmirror.gnu.org/readline/readline-8.0.tar.gz#e339f51971478d369f8a053a330a190781acb9864cf4c541060f12078948e461" mac_readline --if has_broken_mac_readline
 install_git "Python-3.4-dev" "https://github.com/python/cpython" "3.4" standard verify_py34 ensurepip
diff --git a/plugins/python-build/share/python-build/3.4.0 b/plugins/python-build/share/python-build/3.4.0
index 64efa3e3..921b0dc8 100644
--- a/plugins/python-build/share/python-build/3.4.0
+++ b/plugins/python-build/share/python-build/3.4.0
@@ -1,3 +1,4 @@
+export PYTHON_CFLAGS="${PYTHON_CFLAGS:+$PYTHON_CFLAGS }-std=c99"
 install_package "openssl-1.0.2k" "https://www.openssl.org/source/old/1.0.2/openssl-1.0.2k.tar.gz#6b3977c61f2aedf0f96367dcfb5c6e578cf37e7b8d913b4ecb6643c3cb88d8c0" mac_openssl --if has_broken_mac_openssl
 install_package "readline-8.0" "https://ftpmirror.gnu.org/readline/readline-8.0.tar.gz#e339f51971478d369f8a053a330a190781acb9864cf4c541060f12078948e461" mac_readline --if has_broken_mac_readline
 if has_tar_xz_support; then
diff --git a/plugins/python-build/share/python-build/3.4.1 b/plugins/python-build/share/python-build/3.4.1
index e69c40a1..bf5d4f9c 100644
--- a/plugins/python-build/share/python-build/3.4.1
+++ b/plugins/python-build/share/python-build/3.4.1
@@ -1,3 +1,4 @@
+export PYTHON_CFLAGS="${PYTHON_CFLAGS:+$PYTHON_CFLAGS }-std=c99"
 install_package "openssl-1.0.2k" "https://www.openssl.org/source/old/1.0.2/openssl-1.0.2k.tar.gz#6b3977c61f2aedf0f96367dcfb5c6e578cf37e7b8d913b4ecb6643c3cb88d8c0" mac_openssl --if has_broken_mac_openssl
 install_package "readline-8.0" "https://ftpmirror.gnu.org/readline/readline-8.0.tar.gz#e339f51971478d369f8a053a330a190781acb9864cf4c541060f12078948e461" mac_readline --if has_broken_mac_readline
 if has_tar_xz_support; then
diff --git a/plugins/python-build/share/python-build/3.4.10 b/plugins/python-build/share/python-build/3.4.10
index 4ee2a250..775e5450 100644
--- a/plugins/python-build/share/python-build/3.4.10
+++ b/plugins/python-build/share/python-build/3.4.10
@@ -1,3 +1,4 @@
+export PYTHON_CFLAGS="${PYTHON_CFLAGS:+$PYTHON_CFLAGS }-std=c99"
 install_package "openssl-1.0.2k" "https://www.openssl.org/source/old/1.0.2/openssl-1.0.2k.tar.gz#6b3977c61f2aedf0f96367dcfb5c6e578cf37e7b8d913b4ecb6643c3cb88d8c0" mac_openssl --if has_broken_mac_openssl
 install_package "readline-8.0" "https://ftpmirror.gnu.org/readline/readline-8.0.tar.gz#e339f51971478d369f8a053a330a190781acb9864cf4c541060f12078948e461" mac_readline --if has_broken_mac_readline
 has_tar_xz_support \
diff --git a/plugins/python-build/share/python-build/3.4.2 b/plugins/python-build/share/python-build/3.4.2
index c02ce307..235fefd3 100644
--- a/plugins/python-build/share/python-build/3.4.2
+++ b/plugins/python-build/share/python-build/3.4.2
@@ -1,3 +1,4 @@
+export PYTHON_CFLAGS="${PYTHON_CFLAGS:+$PYTHON_CFLAGS }-std=c99"
 install_package "openssl-1.0.2k" "https://www.openssl.org/source/old/1.0.2/openssl-1.0.2k.tar.gz#6b3977c61f2aedf0f96367dcfb5c6e578cf37e7b8d913b4ecb6643c3cb88d8c0" mac_openssl --if has_broken_mac_openssl
 install_package "readline-8.0" "https://ftpmirror.gnu.org/readline/readline-8.0.tar.gz#e339f51971478d369f8a053a330a190781acb9864cf4c541060f12078948e461" mac_readline --if has_broken_mac_readline
 if has_tar_xz_support; then
diff --git a/plugins/python-build/share/python-build/3.4.3 b/plugins/python-build/share/python-build/3.4.3
index 138b0528..c9d83bc0 100644
--- a/plugins/python-build/share/python-build/3.4.3
+++ b/plugins/python-build/share/python-build/3.4.3
@@ -1,3 +1,4 @@
+export PYTHON_CFLAGS="${PYTHON_CFLAGS:+$PYTHON_CFLAGS }-std=c99"
 install_package "openssl-1.0.2k" "https://www.openssl.org/source/old/1.0.2/openssl-1.0.2k.tar.gz#6b3977c61f2aedf0f96367dcfb5c6e578cf37e7b8d913b4ecb6643c3cb88d8c0" mac_openssl --if has_broken_mac_openssl
 install_package "readline-8.0" "https://ftpmirror.gnu.org/readline/readline-8.0.tar.gz#e339f51971478d369f8a053a330a190781acb9864cf4c541060f12078948e461" mac_readline --if has_broken_mac_readline
 if has_tar_xz_support; then
diff --git a/plugins/python-build/share/python-build/3.4.4 b/plugins/python-build/share/python-build/3.4.4
index 2a814cea..5a625fff 100644
--- a/plugins/python-build/share/python-build/3.4.4
+++ b/plugins/python-build/share/python-build/3.4.4
@@ -1,3 +1,4 @@
+export PYTHON_CFLAGS="${PYTHON_CFLAGS:+$PYTHON_CFLAGS }-std=c99"
 install_package "openssl-1.0.2k" "https://www.openssl.org/source/old/1.0.2/openssl-1.0.2k.tar.gz#6b3977c61f2aedf0f96367dcfb5c6e578cf37e7b8d913b4ecb6643c3cb88d8c0" mac_openssl --if has_broken_mac_openssl
 install_package "readline-8.0" "https://ftpmirror.gnu.org/readline/readline-8.0.tar.gz#e339f51971478d369f8a053a330a190781acb9864cf4c541060f12078948e461" mac_readline --if has_broken_mac_readline
 if has_tar_xz_support; then
diff --git a/plugins/python-build/share/python-build/3.4.5 b/plugins/python-build/share/python-build/3.4.5
index 8d887ad2..8bf5486e 100644
--- a/plugins/python-build/share/python-build/3.4.5
+++ b/plugins/python-build/share/python-build/3.4.5
@@ -1,3 +1,4 @@
+export PYTHON_CFLAGS="${PYTHON_CFLAGS:+$PYTHON_CFLAGS }-std=c99"
 install_package "openssl-1.0.2k" "https://www.openssl.org/source/old/1.0.2/openssl-1.0.2k.tar.gz#6b3977c61f2aedf0f96367dcfb5c6e578cf37e7b8d913b4ecb6643c3cb88d8c0" mac_openssl --if has_broken_mac_openssl
 install_package "readline-8.0" "https://ftpmirror.gnu.org/readline/readline-8.0.tar.gz#e339f51971478d369f8a053a330a190781acb9864cf4c541060f12078948e461" mac_readline --if has_broken_mac_readline
 if has_tar_xz_support; then
diff --git a/plugins/python-build/share/python-build/3.4.6 b/plugins/python-build/share/python-build/3.4.6
index 5c5c3370..0b0cd3b1 100644
--- a/plugins/python-build/share/python-build/3.4.6
+++ b/plugins/python-build/share/python-build/3.4.6
@@ -1,3 +1,4 @@
+export PYTHON_CFLAGS="${PYTHON_CFLAGS:+$PYTHON_CFLAGS }-std=c99"
 install_package "openssl-1.0.2k" "https://www.openssl.org/source/old/1.0.2/openssl-1.0.2k.tar.gz#6b3977c61f2aedf0f96367dcfb5c6e578cf37e7b8d913b4ecb6643c3cb88d8c0" mac_openssl --if has_broken_mac_openssl
 install_package "readline-8.0" "https://ftpmirror.gnu.org/readline/readline-8.0.tar.gz#e339f51971478d369f8a053a330a190781acb9864cf4c541060f12078948e461" mac_readline --if has_broken_mac_readline
 if has_tar_xz_support; then
diff --git a/plugins/python-build/share/python-build/3.4.7 b/plugins/python-build/share/python-build/3.4.7
index 42032cc9..ffbdb4dc 100644
--- a/plugins/python-build/share/python-build/3.4.7
+++ b/plugins/python-build/share/python-build/3.4.7
@@ -1,3 +1,4 @@
+export PYTHON_CFLAGS="${PYTHON_CFLAGS:+$PYTHON_CFLAGS }-std=c99"
 install_package "openssl-1.0.2k" "https://www.openssl.org/source/old/1.0.2/openssl-1.0.2k.tar.gz#6b3977c61f2aedf0f96367dcfb5c6e578cf37e7b8d913b4ecb6643c3cb88d8c0" mac_openssl --if has_broken_mac_openssl
 install_package "readline-8.0" "https://ftpmirror.gnu.org/readline/readline-8.0.tar.gz#e339f51971478d369f8a053a330a190781acb9864cf4c541060f12078948e461" mac_readline --if has_broken_mac_readline
 if has_tar_xz_support; then
diff --git a/plugins/python-build/share/python-build/3.4.8 b/plugins/python-build/share/python-build/3.4.8
index 69b69c3f..05885643 100644
--- a/plugins/python-build/share/python-build/3.4.8
+++ b/plugins/python-build/share/python-build/3.4.8
@@ -1,3 +1,4 @@
+export PYTHON_CFLAGS="${PYTHON_CFLAGS:+$PYTHON_CFLAGS }-std=c99"
 install_package "openssl-1.0.2k" "https://www.openssl.org/source/old/1.0.2/openssl-1.0.2k.tar.gz#6b3977c61f2aedf0f96367dcfb5c6e578cf37e7b8d913b4ecb6643c3cb88d8c0" mac_openssl --if has_broken_mac_openssl
 install_package "readline-8.0" "https://ftpmirror.gnu.org/readline/readline-8.0.tar.gz#e339f51971478d369f8a053a330a190781acb9864cf4c541060f12078948e461" mac_readline --if has_broken_mac_readline
 if has_tar_xz_support; then
diff --git a/plugins/python-build/share/python-build/3.4.9 b/plugins/python-build/share/python-build/3.4.9
index 1718c73b..618c7c88 100644
--- a/plugins/python-build/share/python-build/3.4.9
+++ b/plugins/python-build/share/python-build/3.4.9
@@ -1,3 +1,4 @@
+export PYTHON_CFLAGS="${PYTHON_CFLAGS:+$PYTHON_CFLAGS }-std=c99"
 install_package "openssl-1.0.2k" "https://www.openssl.org/source/old/1.0.2/openssl-1.0.2k.tar.gz#6b3977c61f2aedf0f96367dcfb5c6e578cf37e7b8d913b4ecb6643c3cb88d8c0" mac_openssl --if has_broken_mac_openssl
 install_package "readline-8.0" "https://ftpmirror.gnu.org/readline/readline-8.0.tar.gz#e339f51971478d369f8a053a330a190781acb9864cf4c541060f12078948e461" mac_readline --if has_broken_mac_readline
 if has_tar_xz_support; then