Perhaps you should add the directory containing `xorg-server.pc'
seawolf@sammy:~ $ tazpkg search-pkgname xorg-server.pc
Search result for file : xorg-server.pc
================================================================================
xorg-server-dev
================================================================================
1 pkg(s) found with file : xorg-server.pc
tazpkg search-pkgname pixman-1.pc
Search result for file : pixman-1.pc
================================================================================
pixman-dev
================================================================================
1 pkg(s) found with file : pixman-1.pc
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