configure.ac: Use AS_IF() instead of shell-if for PKG_CONFIG
https://autotools.io/pkgconfig/pkg_check_modules.html
> If you have the first call to PKG_CHECK_MODULES inside a bash
> conditional block, the expansion of PKG_PROG_PKG_CONFIG will also be
> conditional
> You can solve this problem in two ways; you can either explicitly call
> PKG_PROG_PKG_CONFIG outside of any conditional, forcing checking for
> pkg-config as soon as possible; or you can rewrite your conditionals
> to use the proper syntax
1 file changed