PKG_CHECK_MODULES on system without pkg-config installed?

[Jef Driesen]

Hi,

I'm trying to use the PKG_CHECK_MODULES macro to check for an external library:

PKG_CHECK_MODULES([LIBUSB], [libusb-1.0], [have_libusb=yes], [have_libusb=no])

This works great, except when trying to compile on a system without pkg-config 
installed. The configure script fails with a syntax error. I tried to wrap the 
PKG_CHECK_MODULES check in an AC_ARG_ENABLE enable block, in an attempt to 
enable to skip this check. But this makes no difference.

Is there another way to make this work?

Jef