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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Envvars not set in subshell in macOS Python 3.7-3.9 configure invocation","articleBody":"**Describe the bug**\r\n\r\nI've tried building Python 3.9.16 on macOS following the dev guide and I believe there is an issue with the command as `pkg-config` fails to get the value set for `PKG_CONFIG_PATH` as, in my limited knowledge of the shell, I believe `pkg-config --libs tcl tk` runs on a subshell.\r\n\r\nThe current `configure` command produces the following output:\r\n\r\n```sh\r\n$ CFLAGS=\"-I$(brew --prefix gdbm)/include -I$(brew --prefix xz)/include\" \\\r\n  LDFLAGS=\"-L$(brew --prefix gdbm)/lib -L$(brew --prefix xz)/lib\" \\\r\n  PKG_CONFIG_PATH=\"$(brew --prefix tcl-tk)/lib/pkgconfig\" \\\r\n  ./configure --with-pydebug \\\r\n          --with-openssl=$(brew --prefix openssl@1.1) \\\r\n          --with-tcltk-libs=\"$(pkg-config --libs tcl tk)\" \\\r\n          --with-tcltk-includes=\"$(pkg-config --cflags tcl tk)\"\r\nPackage tcl was not found in the pkg-config search path.\r\nPerhaps you should add the directory containing `tcl.pc'\r\nto the PKG_CONFIG_PATH environment variable\r\nNo package 'tcl' found\r\nPackage tk was not found in the pkg-config search path.\r\nPerhaps you should add the directory containing `tk.pc'\r\nto the PKG_CONFIG_PATH environment variable\r\nNo package 'tk' found\r\nPackage tcl was not found in the pkg-config search path.\r\nPerhaps you should add the directory containing `tcl.pc'\r\nto the PKG_CONFIG_PATH environment variable\r\nNo package 'tcl' found\r\nPackage tk was not found in the pkg-config search path.\r\nPerhaps you should add the directory containing `tk.pc'\r\nto the PKG_CONFIG_PATH environment variable\r\nNo package 'tk' found\r\n```\r\n\r\n**Expected behavior**\r\n\r\nThe one-line command should properly set `PKG_CONFIG_PATH`.\r\n\r\nI've had success running the following:\r\n\r\n```sh\r\n$ export PKG_CONFIG_PATH=\"$(brew --prefix tcl-tk)/lib/pkgconfig\"; \\\r\nCFLAGS=\"-I$(brew --prefix gdbm)/include -I$(brew --prefix xz)/include\" \\\r\nLDFLAGS=\"-L$(brew --prefix gdbm)/lib -L$(brew --prefix xz)/lib\" \\\r\n./configure --with-pydebug \\\r\n          --with-openssl=$(brew --prefix openssl@1.1) \\\r\n          --with-tcltk-libs=\"$(pkg-config --libs tcl tk)\" \\\r\n          --with-tcltk-includes=\"$(pkg-config --cflags tcl tk)\"\r\nchecking build system type... aarch64-apple-darwin22.3.0\r\nchecking host system type... aarch64-apple-darwin22.3.0\r\nchecking for python3.9... python3.9\r\nchecking for --enable-universalsdk... no\r\nchecking for --with-universal-archs... no\r\nchecking MACHDEP... \"darwin\"\r\nchecking for gcc... gcc\r\nchecking whether the C compiler works... yes\r\nchecking for C compiler default output file name... a.out\r\nchecking for suffix of executables...\r\nchecking whether we are cross compiling... no\r\nchecking for suffix of object files... o\r\nchecking whether we are using the GNU C compiler... yes\r\nchecking whether gcc accepts -g... yes\r\nchecking for gcc option to accept ISO C89... none needed\r\nchecking how to run the C preprocessor... gcc -E\r\nchecking for grep that handles long lines and -e... /usr/bin/grep\r\nchecking for a sed that does not truncate output... /usr/bin/sed\r\nchecking for --with-cxx-main=\u003ccompiler\u003e... no\r\nchecking for g++... no\r\nconfigure:\r\n\r\n  By default, distutils will build C++ extension modules with \"g++\".\r\n  If this is not intended, then set CXX on the configure command line.\r\n\r\nchecking for the platform triplet based on compiler characteristics... darwin\r\nchecking for multiarch...\r\nchecking for -Wl,--no-as-needed... no\r\nchecking for egrep... /usr/bin/grep -E\r\nchecking for ANSI C header files... yes\r\nchecking for sys/types.h... yes\r\nchecking for sys/stat.h... yes\r\nchecking for stdlib.h... yes\r\nchecking for string.h... yes\r\nchecking for memory.h... yes\r\nchecking for strings.h... yes\r\nchecking for inttypes.h... yes\r\nchecking for stdint.h... yes\r\nchecking for unistd.h... yes\r\nchecking minix/config.h usability... no\r\nchecking minix/config.h presence... ^C%\r\n```\r\n\r\n**Additional context**\r\n\r\nThere must be something that can be done differently, but I know I'm no expert in the matter.\r\n","author":{"url":"https://github.com/cesarcoatl","@type":"Person","name":"cesarcoatl"},"datePublished":"2023-02-09T16:37:26.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":8},"url":"https://github.com/1049/devguide/issues/1049"}