libsinsp.pc references build tree instead of install prefix

[Apteryks]

Describe the bug

Notice the references to /tmp/guix-build-falcosecurity-libs-0.15.1-drv-0 in the pkg-config libsinsp.pc file, as shown by the grep command below:

$ grep -rin guix-build /gnu/store/c363y8pvmynd2c8dg83802891n4v03nr-falcosecurity-libs-0.15.1
grep: /gnu/store/c363y8pvmynd2c8dg83802891n4v03nr-falcosecurity-libs-0.15.1/lib/libscap_engine_savefile.a : fichiers binaires correspondent
/gnu/store/c363y8pvmynd2c8dg83802891n4v03nr-falcosecurity-libs-0.15.1/lib/pkgconfig/libsinsp.pc:11:Cflags: -I${includedir}/falcosecurity/libsinsp -I/tmp/guix-build-falcosecurity-libs-0.15.1.drv-0/source -I/tmp/guix-build-falcosecurity-libs-0.15.1.drv-0/source/userspace -I/tmp/guix-build-falcosecurity-libs-0.15.1.drv-0/source/userspace/libscap -I/tmp/guix-build-falcosecurity-libs-0.15.1.drv-0/build -I/tmp/guix-build-falcosecurity-libs-0.15.1.drv-0/build/driver/src -I/gnu/store/vbb4mazz64v6gy10nzz1dp1ixk690fav-tbb-2021.6.0/include/tbb -I/gnu/store/9jkzwa8j0ag4n0bwmdwn9k313ilwgywf-jsoncpp-1.9.5/include -I/gnu/store/m57i4jra2yg42sz886qyz6x5qz2bxiai-valijson-1.0.2/include -I/gnu/store/4w850l8yy5lj5mvrfq253bcs8axhnizc-re2-2022-12-01/include -I/gnu/store/0kzjzrgsn7k1clc6mxk5ndfmsikwm7wz-c-ares-1.18.1/include -I/gnu/store/54cqjg46c15qsx75b63rfbmvshw8w5nd-curl-8.5.0/include

This then causes issues like:

CMake Error in userspace/sysdig/CMakeLists.txt:
  Imported target "PkgConfig::LIBSINSP" includes non-existent path

    "/tmp/guix-build-falcosecurity-libs-0.15.1.drv-0/source"

  in its INTERFACE_INCLUDE_DIRECTORIES.  Possible reasons include:

  * The path was deleted, renamed, or moved to another location.

  * An install or uninstall procedure did not complete successfully.

  * The installation package was faulty and references files it does not
  provide.

With CMake when one tries to use it with pkg_check_modules.

How to reproduce it

Build it in a different location than its installation prefix.

Expected behaviour

The pkg-config file include directives in CFLAGS should refer to the installed files in their final location (installation prefix), not those from the build tree.

Environment

• Falco version: 0.15.1
• OS: Guix System
• Kernel: Linux hurd 6.8.8-gnu update: delete notices about chisels #1 SMP PREEMPT_DYNAMIC 1 x86_64 GNU/Linux
• Installation method: From source.

[Apteryks]

A workaround is to remove the @SINSP_PKG_CONFIG_INCLUDES@ template variable from the userspace/libsinsp/libsinsp.pc.in source file before configuration.