[Cin] Tried to add PKG_CHECK_MODULES to configure.ac

[Andrew Randrianasulu]

well, it "works" by now, as in - it detects my non-std X11 installation prefix.

documentation I was reading:
https://autotools.io/pkgconfig/pkg_check_modules.html

Problem is - for making it work that far I was forced to rename some
PKG_* names from configure.ac into PKG1_* .... otherwise autoconf was 
complaining loudly about undefined macro:


configure:6226: error: possibly undefined macro: PKG_FREETYPE
configure:6288: error: possibly undefined macro: PKG_LZMA
configure:6350: error: possibly undefined macro: PKG_PNG
configure:6412: error: possibly undefined macro: PKG_PTHREAD
configure:6474: error: possibly undefined macro: PKG_Z
configure:6721: error: possibly undefined macro: PKG_LINUX_CDROM
configure:6747: error: possibly undefined macro: PKG_LINUX_SYS
configure:8780: error: possibly undefined macro: PKG_VDPAU
configure:8846: error: possibly undefined macro: PKG_VAAPI
configure:9101: error: possibly undefined macro: PKG_GL
configure:9358: error: possibly undefined macro: PKG_XV
configure:9395: error: possibly undefined macro: PKG_OSS
configure:9423: error: possibly undefined macro: PKG_XFT
configure:9530: error: possibly undefined macro: PKG_ALSA
configure:9973: error: possibly undefined macro: PKG_OGG
configure:10331: error: possibly undefined macro: PKG_FIREWIRE
configure:10446: error: possibly undefined macro: PKG_DV
configure:10484: error: possibly undefined macro: PKG_DVB
configure:10772: error: possibly undefined macro: PKG_ESOUND
configure:10969: error: possibly undefined macro: PKG_PULSE
configure:11013: error: possibly undefined macro: PKG_ISOFS
configure:11058: error: possibly undefined macro: PKG_LADSPA
configure:11105: error: possibly undefined macro: PKG_SHUTTLE
configure:11213: error: possibly undefined macro: PKG_SHUTTLE_USB
configure:11646: error: possibly undefined macro: PKG_CUDA
configure:11674: error: possibly undefined macro: PKG_DL
configure:11760: error: possibly undefined macro: PKG_OPENCV
configure:11781: error: possibly undefined macro: PKG_NUMA
configure:11980: error: possibly undefined macro: PKG_OPENEXR

yes, even from just trying ./autogen.sh

I wonder how this problem must be solved, correctly?

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