Rename PYTHON_BUILD_TCLTK_FORMULA to PYTHON_BUILD_HOMEBREW_TCLTK_FORMULA; deprecate the old name (#3580)

* Update tcl/tk note

CHANGELOG.md

@@ -1,5 +1,9 @@
 # Version History
 
+## Release v2.8.8
+* pyenv-binary: allow local definitions to override published packages by @macayu17 in https://github.com/pyenv/pyenv/pull/3577
+* exec: add the `--environment` option for programs that embed `libpython` without a path by @Romwierz in https://github.com/pyenv/pyenv/pull/3537
+* Add CPython 3.15.0rc3 by @pyenv-bot[bot] in https://github.com/pyenv/pyenv/pull/3578
 
 ## Release v2.8.7
 * Fix rehash repair of individually corrupted shims by @aprylewu in https://github.com/pyenv/pyenv/pull/3540

COMMANDS.md

@@ -315,7 +315,7 @@ Lists all Python versions with the given command installed.
 
 ## `pyenv exec`
 
-    Usage: pyenv exec <command> [arg1 arg2...]
+    Usage: pyenv exec [-N|--environment] <command> [arg1 arg2...]
 
 Runs an executable by first preparing PATH so that the selected Python
 version's `bin` directory is at the front.
@@ -326,7 +326,18 @@ For example, if the currently selected Python version is 3.9.7:
     
 is equivalent to:
 
-    PATH="$PYENV_ROOT/versions/3.9.7/bin:$PATH" pip install -r requirements.txt
+    PYENV_VERSION="3.9.7" PATH="$PYENV_ROOT/versions/3.9.7/bin:$PATH" pip install -r requirements.txt
+    
+The `--environment` option sets `PYTHONHOME` and `LD_LIBRARY_PATH` (`DYLD_LIBRARY_PATH` in macOS) in the program's environment.
+This is needed to run programs that embed Python by loading `libpython` without specifying rpath or an explicit path.
+This breaks linking for programs that expect to link to a different `libpython` with the same name as one
+in selected Python -- thus it's not done by default.
+
+In macOS, System Integrity Protection (SIP) removes `DYLD_LIBRARY_PATH` from a process' environment
+upon `exec` (not `fork`) if the executable being run is protected. The protection covers preinstalled system software
+(including preinstalled shells) and does not cover user-installed apps and 3rd-party software. See
+[About System Integrity Protection on your Mac - Apple Support](https://support.apple.com/en-us/102149)
+for details.
 
 ## `pyenv root`
 

libexec/pyenv---version

@@ -12,7 +12,7 @@
 set -e
 [ -n "$PYENV_DEBUG" ] && set -x
 
-version="2.8.7"
+version="2.8.8"
 git_revision=""
 
 if cd "${BASH_SOURCE%/*}" 2>/dev/null && git remote -v 2>/dev/null | grep -q pyenv; then

libexec/pyenv-exec

@@ -2,7 +2,17 @@
 #
 # Summary: Run an executable with the selected Python version
 #
-# Usage: pyenv exec <command> [arg1 arg2...]
+# Usage: pyenv exec [-N|--environment] <command> [arg1 arg2...]
+#
+#    -N/--environment   Set PYTHONHOME and LD_LIBRARY_PATH (DYLD_LIBRARY_PATH in macOS)
+#                   envvars for the running command.
+#                   This allows to run programs that embed Python without using rpath or
+#                   exact library path to libpython.
+#                   WARNING: For the running command and its child processes, this will
+#                   break linkage for programs that expect to be linked to a different
+#                   libpython instance with the same name!
+#                   WARNING: In macOS, DYLD_LIBRARY_PATH will be unset by the system for
+#                   processes covered by System Integrity Protection.
 #
 # Runs an executable by first preparing PATH so that the selected Python
 # version's `bin' directory is at the front.
@@ -18,9 +28,16 @@ set -e
 
 # Provide pyenv completions
 if [ "$1" = "--complete" ]; then
+  echo --environment
   exec pyenv-shims --short
 fi
 
+unset MODIFY_ENV
+if [ "$1" = "-N" ] || [ "$1" = "--environment" ]; then
+  MODIFY_ENV=true
+  shift
+fi
+
 PYENV_VERSION="$(pyenv-version-name -f)"
 PYENV_COMMAND="$1"
 
@@ -54,4 +71,27 @@ if [ "${PYENV_BIN_PATH#${PYENV_ROOT}}" != "${PYENV_BIN_PATH}" ]; then
   # Only add to $PATH for non-system version.
   export PATH="${PYENV_BIN_PATH}:${PATH}"
 fi
+if [ -n "$MODIFY_ENV" ]; then
+
+  # Check if multiple Python versions are selected
+  VERSIONS=$(pyenv-prefix)
+  if [[ "$VERSIONS" == *:* ]]; then
+    VERSION="${VERSIONS%%:*}"
+    echo "pyenv: Warning: multiple Python versions are selected." \
+    "Setting environment variables for the first one, (${VERSION#$PYENV_ROOT})" >&2
+  else
+    VERSION="$VERSIONS"
+  fi
+
+  # Assign the correct version of PYTHONHOME
+  export PYTHONHOME="$VERSION"
+  case "$(uname -s)" in
+    Darwin)
+      export DYLD_LIBRARY_PATH="${PYTHONHOME}/lib${DYLD_LIBRARY_PATH:+:${DYLD_LIBRARY_PATH}}"
+      ;;
+    *)
+      export LD_LIBRARY_PATH="${PYTHONHOME}/lib${LD_LIBRARY_PATH:+:${LD_LIBRARY_PATH}}"
+      ;;
+  esac
+fi
 exec "$PYENV_COMMAND_PATH" "$@"

plugins/pyenv-binary/README.md

@@ -33,6 +33,11 @@ proceeds.
 pyenv binary install 3.14.7
 ```
 
+A definition with the selected package entry's name in a plugin's
+`share/python-build` directory overrides the published definition. The normal
+Python-Build search order applies, including `PYTHON_BUILD_DEFINITIONS`.
+Local definitions are installed without downloading the stock definition.
+
 ### `pyenv binary package [-v|--verbose] <version>[:<entry>] --archive-base-url <url>`
 
 Installs `<version>` from source under a separate name, packages that install

plugins/pyenv-binary/libexec/pyenv-binary-install

@@ -100,10 +100,12 @@ if [ -z "$entry" ]; then
   echo "pyenv-binary: no binary available for $requested on $os/$arch" >&2
   exit 1
 fi
-if ! [[ "$expected_sha" =~ ^[0-9a-fA-F]{64}$ ]]; then
-  echo "pyenv-binary: invalid checksum for $entry" >&2
-  exit 1
+definitions="$(pyenv-install --list --bare)"
+if grep -qxF -- "$entry" <<<"$definitions"; then
+  pyenv-install "$entry:$version"
+  exit
 fi
+
 expected_sha="$(printf '%s' "$expected_sha" | tr '[:upper:]' '[:lower:]')"
 
 curl -fsSL -o "$tmpdir/$entry" "$base_url/$entry"
@@ -117,7 +119,7 @@ else
   echo "pyenv-binary: need sha256sum, shasum or openssl to verify $entry" >&2
   exit 1
 fi
-if [ "$actual_sha" != "$expected_sha" ]; then
+if [[ $expected_sha != "$actual_sha"  ]]; then
   echo "pyenv-binary: checksum mismatch for $entry" >&2
   exit 1
 fi

plugins/pyenv-binary/test/install.bats

@@ -44,7 +44,7 @@ STUB
     "$(host_distro)" 0 >> "$BATS_TEST_TMPDIR/plugin/share/pyenv-binary/versions/3.14"
   stub_downloads
   create_stub uname 'case "$1" in -s) echo Linux;; -m) echo x86_64;; esac'
-  create_stub pyenv-install 'echo installed'
+  create_stub pyenv-install '[ "$1" = --list ] && exit; echo installed'
 
   run pyenv-binary-install 3.14.7
   assert_failure
@@ -58,6 +58,50 @@ STUB
   assert_success ""
 }
 
+@test "a plugin definition overrides a published binary without its checksum" {
+  create_stub lsb_release 'case "$1" in -si) echo Ubuntu;; -sr) echo 24.04;; esac'
+  use_manifest
+  export TMPDIR="$BATS_TEST_TMPDIR/temp"
+  mkdir -p "$TMPDIR"
+  local entry="3.14.7-ubuntu-24.04-x86_64"
+  printf '3.14.7\t%s\tLinux\tx86_64\t%s\t%s\n' "$entry" \
+    "$(host_distro)" "" >> "$BATS_TEST_TMPDIR/plugin/share/pyenv-binary/versions/3.14"
+  create_stub uname 'case "$1" in -s) echo Linux;; -m) echo x86_64;; esac'
+  create_stub curl 'touch "$BATS_TEST_TMPDIR/downloaded"; exit 1'
+  PATH="${BATS_TEST_DIRNAME}/../../python-build/bin:$PATH"
+  mkdir -p "$PYENV_ROOT/plugins/first/share/python-build" "$PYENV_ROOT/plugins/second/share/python-build"
+  printf '%s\n' 'mkdir -p "$PREFIX_PATH"; echo first > "$PREFIX_PATH/marker"' \
+    > "$PYENV_ROOT/plugins/first/share/python-build/$entry"
+  echo 'exit 1' > "$PYENV_ROOT/plugins/second/share/python-build/$entry"
+
+  run pyenv-binary-install 3.14
+  assert_success ""
+  assert_equal first "$(cat "$PYENV_ROOT/versions/3.14.7/marker")"
+  [ ! -e "$BATS_TEST_TMPDIR/downloaded" ]
+  assert_equal "" "$(find "$TMPDIR" -mindepth 1 -maxdepth 1 -type d)"
+}
+
+@test "an explicit definition path takes precedence over a plugin definition" {
+  create_stub lsb_release 'case "$1" in -si) echo Ubuntu;; -sr) echo 24.04;; esac'
+  use_manifest
+  local entry="3.14.7-ubuntu-24.04-x86_64"
+  printf '3.14.7\t%s\tLinux\tx86_64\t%s\t%s\n' "$entry" \
+    "$(host_distro)" "$definition_sha" >> "$BATS_TEST_TMPDIR/plugin/share/pyenv-binary/versions/3.14"
+  create_stub uname 'case "$1" in -s) echo Linux;; -m) echo x86_64;; esac'
+  create_stub curl 'touch "$BATS_TEST_TMPDIR/downloaded"; exit 1'
+  PATH="${BATS_TEST_DIRNAME}/../../python-build/bin:$PATH"
+  export PYTHON_BUILD_DEFINITIONS="$BATS_TEST_TMPDIR/custom definitions"
+  mkdir -p "$PYTHON_BUILD_DEFINITIONS" "$PYENV_ROOT/plugins/custom/share/python-build"
+  printf '%s\n' 'mkdir -p "$PREFIX_PATH"; echo custom > "$PREFIX_PATH/marker"' \
+    > "$PYTHON_BUILD_DEFINITIONS/$entry"
+  echo 'exit 1' > "$PYENV_ROOT/plugins/custom/share/python-build/$entry"
+
+  run pyenv-binary-install 3.14.7
+  assert_success ""
+  assert_equal custom "$(cat "$PYENV_ROOT/versions/3.14.7/marker")"
+  [ ! -e "$BATS_TEST_TMPDIR/downloaded" ]
+}
+
 @test "installs a matching published binary with an uppercase checksum" {
   create_stub lsb_release 'case "$1" in -si) echo Ubuntu;; -sr) echo 24.04;; esac'
   use_manifest
@@ -70,6 +114,7 @@ STUB
   stub_downloads
   create_stub uname 'case "$1" in -s) echo Linux;; -m) echo x86_64;; esac'
   create_stub pyenv-install <<'STUB'
+[ "$1" = --list ] && exit
 definition="${1%:*}"
 printf '%s:%s\n' "${definition##*/}" "${1##*:}"
 cat "$definition"
@@ -89,7 +134,7 @@ definition"
     "$(host_distro)" "$definition_sha" >> "$BATS_TEST_TMPDIR/plugin/share/pyenv-binary/versions/3.14"
   stub_downloads
   create_stub uname 'case "$1" in -s) echo Linux;; -m) echo x86_64;; esac'
-  create_stub pyenv-install 'echo "${1##*:}"'
+  create_stub pyenv-install '[ "$1" = --list ] && exit; echo "${1##*:}"'
 
   run pyenv-binary-install 3.14
   assert_success "3.14.10"
@@ -125,7 +170,7 @@ definition"
   stub_downloads
   create_stub uname 'case "$1" in -s) echo Darwin;; -m) echo arm64;; esac'
   create_stub sw_vers 'echo 26.6.2'
-  create_stub pyenv-install 'echo "${1##*:}"'
+  create_stub pyenv-install '[ "$1" = --list ] && exit; echo "${1##*:}"'
 
   run pyenv-binary-install 3.14.7
   assert_success "3.14.7"
@@ -137,7 +182,7 @@ definition"
     "$definition_sha" >> "$BATS_TEST_TMPDIR/plugin/share/pyenv-binary/versions/3.14"
   create_stub uname 'case "$1" in -s) echo Darwin;; -m) echo arm64;; esac'
   create_stub sw_vers 'echo 15.7.8'
-  create_stub pyenv-install 'echo installed'
+  create_stub pyenv-install '[ "$1" = --list ] && exit; echo installed'
 
   run pyenv-binary-install 3.14.7
   assert_failure "pyenv-binary: no binary available for 3.14.7 on Darwin/arm64"

plugins/python-build/README.md

@@ -182,13 +182,13 @@ You can set certain environment variables to control the build process.
   their original source URLs instead of using a mirror.
 * `PYTHON_BUILD_HTTP_CLIENT`, explicitly specify the HTTP client type to use. `aria2`, `curl` and `wget` are the supported values and by default, are searched in that order.
 * `PYTHON_BUILD_CURL_OPTS`, `PYTHON_BUILD_WGET_OPTS`, `PYTHON_BUILD_ARIA2_OPTS` pass additional parameters to the corresponding HTTP client.
-* `PYTHON_BUILD_SKIP_HOMEBREW`, if set, will not search for libraries installed by Homebrew when it would normally will.
-* `PYTHON_BUILD_USE_HOMEBREW`, if set, will search for libraries installed by Homebrew when it would normally not.
+* `PYTHON_BUILD_SKIP_HOMEBREW`, if set, will not search for libraries installed by Homebrew when it normally would.
+* `PYTHON_BUILD_USE_HOMEBREW`, if set, will search for libraries installed by Homebrew when it normally wouldn't.
 * `PYTHON_BUILD_HOMEBREW_OPENSSL_FORMULA`, override the Homebrew OpenSSL formula to use.
 * `PYTHON_BUILD_MACPORTS_OPENSSL_FORMULA`, override the MacPorts OpenSSL formula to use. The default is `openssl3 openssl`.
-* `PYTHON_BUILD_TCLTK_FORMULA`, override the Homebrew Tcl/Tk formula to use.
-* `PYTHON_BUILD_SKIP_MACPORTS`, if set, will not search for libraries installed by MacPorts when it would normally will.
-* `PYTHON_BUILD_USE_MACPORTS`, if set, will search for libraries installed by MacPorts when it would normally not.
+* `PYTHON_BUILD_HOMEBREW_TCLTK_FORMULA`, override the Homebrew Tcl/Tk formula to use.
+* `PYTHON_BUILD_SKIP_MACPORTS`, if set, will not search for libraries installed by MacPorts when it normally would.
+* `PYTHON_BUILD_USE_MACPORTS`, if set, will search for libraries installed by MacPorts when it normally wouldn't.
 * `PYTHON_BUILD_ROOT` overrides the default location from where build definitions
   in `share/python-build/` are looked up.
 * `PYTHON_BUILD_DEFINITIONS` can be a list of colon-separated paths that get

plugins/python-build/bin/python-build

@@ -14,7 +14,7 @@
 #   -g/--debug       Build a debug version
 #
 
-PYTHON_BUILD_VERSION="2.8.7"
+PYTHON_BUILD_VERSION="2.8.8"
 
 OLDIFS="$IFS"
 
@@ -2006,9 +2006,14 @@ use_homebrew_tcltk() {
   can_use_homebrew || return 1
   local tcltk_formula
   # Since https://github.com/Homebrew/homebrew-core/commit/f10e88617b41555193c22fdcba6109fe82155ee2 (10.11.2024),
-  # tcl-tk is 9.0. It's supported in CPython since 3.14.0a1 (gh-124111) but is not officially supported as of 3.14.0
-  # so we prefer 8
-  for tcltk_formula in ${PYTHON_BUILD_TCLTK_FORMULA:-tcl-tk@8 tcl-tk}; do
+  # tcl-tk is 9.0. It's supported in CPython since 3.14.0a1 (gh-124111) but is not officially supported as of 3.14.0,
+  # as of 3.15.0rc3, there are still test failures.
+  # So we prefer 8.
+  if [[ -n $PYTHON_BUILD_TCLTK_FORMULA ]]; then
+    export PYTHON_BUILD_HOMEBREW_TCLTK_FORMULA="${PYTHON_BUILD_HOMEBREW_TCLTK_FORMULA:-$PYTHON_BUILD_TCLTK_FORMULA}"
+    echo "warning: the PYTHON_BUILD_TCLTK_FORMULA envvar has been renamed to PYTHON_BUILD_HOMEBREW_TCLTK_FORMULA" >&2
+  fi
+  for tcltk_formula in ${PYTHON_BUILD_HOMEBREW_TCLTK_FORMULA:-tcl-tk@8 tcl-tk}; do
     local tcltk_prefix="$(brew --prefix "${tcltk_formula}" 2>/dev/null || true)"
     if [ -d "$tcltk_prefix" ]; then
       echo "python-build: use ${tcltk_formula} from homebrew"

plugins/python-build/share/python-build/3.15.0rc2

@@ -1,11 +0,0 @@
-prefer_openssl3
-export PYTHON_BUILD_CONFIGURE_WITH_OPENSSL=1
-export PYTHON_BUILD_CONFIGURE_WITH_OPENSSL_RPATH=1
-export PYTHON_BUILD_TCLTK_USE_PKGCONFIG=1
-install_package "openssl-4.0.2" "https://github.com/openssl/openssl/releases/download/openssl-4.0.2/openssl-4.0.2.tar.gz#736b467530f916737b7031310ccb21d8218c6229e61e8e160cd1d3458cd543a8" mac_openssl --if has_broken_mac_openssl
-install_package "readline-8.3" "https://ftpmirror.gnu.org/readline/readline-8.3.tar.gz#fe5383204467828cd495ee8d1d3c037a7eba1389c22bc6a041f627976f9061cc" mac_readline --if has_broken_mac_readline
-if has_tar_xz_support; then
-    install_package "Python-3.15.0rc2" "https://www.python.org/ftp/python/3.15.0/Python-3.15.0rc2.tar.xz#8d93af5eaaaea5adfd41bd786a7ba3f03f2ad1ab57c6a65e0b963deab91d5ad7" standard verify_py315 copy_python_gdb ensurepip
-else
-    install_package "Python-3.15.0rc2" "https://www.python.org/ftp/python/3.15.0/Python-3.15.0rc2.tgz#164dbb80f5e1fdd8768387724bfa014da1000401b2015d872a2396c8b858b829" standard verify_py315 copy_python_gdb ensurepip
-fi

plugins/python-build/share/python-build/3.15.0rc3

@@ -0,0 +1,11 @@
+prefer_openssl3
+export PYTHON_BUILD_CONFIGURE_WITH_OPENSSL=1
+export PYTHON_BUILD_CONFIGURE_WITH_OPENSSL_RPATH=1
+export PYTHON_BUILD_TCLTK_USE_PKGCONFIG=1
+install_package "openssl-4.0.3" "https://github.com/openssl/openssl/releases/download/openssl-4.0.3/openssl-4.0.3.tar.gz#325b5c806167c13b40b1ffeadfe0248197c00eccc4cf123ec1e28d2d2fd216d9" mac_openssl --if has_broken_mac_openssl
+install_package "readline-8.3" "https://ftpmirror.gnu.org/readline/readline-8.3.tar.gz#fe5383204467828cd495ee8d1d3c037a7eba1389c22bc6a041f627976f9061cc" mac_readline --if has_broken_mac_readline
+if has_tar_xz_support; then
+    install_package "Python-3.15.0rc3" "https://www.python.org/ftp/python/3.15.0/Python-3.15.0rc3.tar.xz#506630aa66d5441188f34df22c0760bfe87fc92212630493ebc9ff3b3a7a1d49" standard verify_py315 copy_python_gdb ensurepip
+else
+    install_package "Python-3.15.0rc3" "https://www.python.org/ftp/python/3.15.0/Python-3.15.0rc3.tgz#98a6264c7a48e4ce0f9a9ea4bdd211ea9fcff32b55c79c5efc1ae6d91b032210" standard verify_py315 copy_python_gdb ensurepip
+fi

plugins/python-build/test/build.bats

@@ -1066,8 +1066,10 @@ make install
 OUT
 }
 
-@test "tcl-tk is linked from Homebrew with PYTHON_BUILD_TCLTK_FORMULA" {
+test_tcltk_var() {
+  local var="${1:?}"
   cached_tarball "Python-3.6.2"
+  
   stub_tcltk "${tcl_tk_libdir:=$BATS_TEST_TMPDIR/homebrew-tcl-tk}"
 
   stub uname '-s : echo Darwin'
@@ -1080,7 +1082,7 @@ OUT
   stub_make_install
 
   run_inline_definition <<DEF
-PYTHON_BUILD_TCLTK_FORMULA=tcl-tk-custom
+$var=tcl-tk-custom
 install_package "Python-3.6.2" "http://python.org/ftp/python/3.6.2/Python-3.6.2.tar.gz"
 DEF
   assert_success
@@ -1098,6 +1100,34 @@ make install
 OUT
 }
 
+@test "tcl-tk is linked from Homebrew with PYTHON_BUILD_HOMEBREW_TCLTK_FORMULA" {
+  test_tcltk_var PYTHON_BUILD_HOMEBREW_TCLTK_FORMULA
+}
+
+@test "tcl-tk is linked from Homebrew with PYTHON_BUILD_TCLTK_FORMULA" {
+  test_tcltk_var PYTHON_BUILD_HOMEBREW_TCLTK_FORMULA
+}
+
+@test "PYTHON_BUILD_TCLTK_FORMULA produces a deprecation warning" {
+  cached_tarball "Python-3.6.2"
+
+  stub uname '-s : echo Darwin'
+  stub sw_vers '-productVersion : echo 1010'
+
+  stub brew '--prefix openssl : false'
+  stub brew "--prefix tcl-tk-custom : echo '$tcl_tk_libdir'"
+  for i in {1..4}; do stub brew false; done
+
+  stub_make_install
+
+  run_inline_definition <<DEF
+PYTHON_BUILD_TCLTK_FORMULA=tcl-tk-whatever
+install_package "Python-3.6.2" "http://python.org/ftp/python/3.6.2/Python-3.6.2.tar.gz"
+DEF
+  assert_success
+  assert_line "warning: the PYTHON_BUILD_TCLTK_FORMULA envvar has been renamed to PYTHON_BUILD_HOMEBREW_TCLTK_FORMULA"
+}
+
 @test "tcl-tk is linked from Homebrew via pkg-config and override vars" {
   cached_tarball "Python-3.6.2" - TCLTK_CFLAGS TCLTK_LIBS
   stub_tcltk "${tcl_tk_libdir:=$BATS_TEST_TMPDIR/homebrew-tcl-tk}"

test/exec.bats

@@ -34,6 +34,7 @@ EOF
   assert_success
   assert_output <<OUT
 --help
+--environment
 fab
 python
 OUT
@@ -139,3 +140,53 @@ $envvarname=/unusual/shim/location:/another/shim/location
 _PYENV_SHIM_PATH=
 !
 }
+
+@test "--environment sets envvars in Linux" {
+  export PYENV_VERSION="test"
+  create_alt_executable print_env <<!
+#!$BASH
+echo PYTHONHOME="\$PYTHONHOME"
+echo LD_LIBRARY_PATH="\$LD_LIBRARY_PATH"
+!
+  create_path_executable uname "echo Linux"
+
+  LD_LIBRARY_PATH= run pyenv-exec -N print_env
+  assert_output_glob <<!
+PYTHONHOME=*/test
+LD_LIBRARY_PATH=*/test/lib
+!
+
+  LD_LIBRARY_PATH=/foo/bar run pyenv-exec -N print_env
+  assert_output_glob <<!
+PYTHONHOME=*/test
+LD_LIBRARY_PATH=*/test/lib:/foo/bar
+!
+}
+
+@test "--environment sets envvars in macOS" {
+  if [[ $(uname -s) == "Darwin" && $BASH == "/bin/bash" \
+      && $(LC_ALL=C csrutil status) == *"enabled." ]]; then
+    skip "macOS with Bash covered by SIP"
+  fi
+  
+  export PYENV_VERSION="test"
+  create_alt_executable print_env <<!
+#!$BASH
+echo PYTHONHOME="\$PYTHONHOME"
+echo DYLD_LIBRARY_PATH="\$DYLD_LIBRARY_PATH"
+!
+  create_path_executable uname "echo Darwin"
+
+  DYLD_LIBRARY_PATH= run pyenv-exec -N print_env
+  assert_output_glob <<!
+PYTHONHOME=*/test
+DYLD_LIBRARY_PATH=*/test/lib
+!
+
+
+  DYLD_LIBRARY_PATH=/foo/bar run pyenv-exec -N print_env
+  assert_output_glob <<!
+PYTHONHOME=*/test
+DYLD_LIBRARY_PATH=*/test/lib:/foo/bar
+!
+}