Fetches the linker flags and C compiler flags for compiling and linking Perl binary extensions. The macro substitutes PERL_EXT_PREFIX, PERL_EXT_INC, PERL_EXT_LIB, PERL_EXT_CPPFLAGS, PERL_EXT_LDFLAGS and PERL_EXT_DLEXT variables if Perl executable was found. It also checks the same variables before trying to retrieve them from the Perl configuration.
PERL_EXT_PREFIX: top-level perl installation path (--prefix) PERL_EXT_INC: XS include directory PERL_EXT_LIB: Perl extensions destination directory PERL_EXT_CPPFLAGS: C preprocessor flags to compile extensions PERL_EXT_LDFLAGS: linker flags to build extensions PERL_EXT_DLEXT: extensions suffix for perl modules (e.g. ".so")
AX_PERL_EXT if test x"$PERL" = x; then AC_ERROR(["cannot find Perl"]) fi
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