build-sys: Give sensible errors if missing pkg-config
pkg-config is used to find various libraries used by procps. Unfortunately it, or rather automake, give terrible misleading error messages if pkg-config is not installed. At ./configure time you get this: configure: error: ncurses support missing/incomplete (for partial build use --without-ncurses) At automake time you get this: configure.ac:33: error: possibly undefined macro: AC_MSG_ERROR If this token and others are legitimate, please use m4_pattern_allow. See the Autoconf documentation. configure.ac:48: error: possibly undefined macro: AS_IF configure.ac:113: error: possibly undefined macro: AC_DEFINE The internet is filled with such wonderful other examples. This commit does two things: At autoconf time, check PKG_PREREQ macro is defined which is found in pkg.m4 and tells us pkg-config has its macros available. At configure time, check the result of the pkg-config test and error if it didn't find it. Now it actually says its missing pkg-config. To be fair, the autoconf check is "documented" and recommended in pkg.m4 file. Signed-off-by: Craig Small <csmall@dropbear.xyz>
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@ -40,7 +40,14 @@ AM_PROG_CC_C_O
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AC_PROG_CPP
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AC_PROG_INSTALL
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AC_PROG_LN_S
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dnl Check pkg-config is there for autoconf and at ./configure
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m4_ifndef([PKG_PREREQ],
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[m4_fatal([must install pkg-config 0.29 or later before running autoconf/autogen])])
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PKG_PROG_PKG_CONFIG
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AS_IF([test -z "$PKG_CONFIG"],[
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AC_MSG_ERROR([Could not find pkg-config])])
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AC_PROG_MAKE_SET
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AC_DEFUN([PROCPS_PROG_PO4A], [
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