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3.6. Software Collection .pc Files Support

The .pc files are special metadata files used by the pkg-config program to store information about libraries available on the system.
In case you distribute .pc files that you intend to use only in the Software Collection environment or in addition to the .pc files installed on the system, update the PKG_CONFIG_PATH environment variable. Depending on what is defined in your .pc files, update the PKG_CONFIG_PATH environment variable for the %{_libdir} macro (which expands to the library directory, typically /usr/lib/ or /usr/lib64/), or for the %{_datadir} macro (which expands to the share directory, typically /usr/share/).
If the library directory is defined in your .pc files, update the PKG_CONFIG_PATH environment variable by adjusting the %install section of the Software Collection spec file as follows: 
%install
cat >> %{buildroot}%{_scl_scripts}/enable << EOF
export PKG_CONFIG_PATH="%{_libdir}/pkgconfig\${PKG_CONFIG_PATH:+:\${PKG_CONFIG_PATH}}"
EOF
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If the share directory is defined in your .pc files, update the PKG_CONFIG_PATH environment variable by adjusting the %install section of the Software Collection spec file as follows: 
%install
cat >> %{buildroot}%{_scl_scripts}/enable << EOF
export PKG_CONFIG_PATH="%{_datadir}/pkgconfig\${PKG_CONFIG_PATH:+:\${PKG_CONFIG_PATH}}"
EOF
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The two examples above both configure the enable scriptlet so that it ensures that the .pc files in the Software Collection are preferred over the .pc files available on the system if the Software Collection is enabled.
The Software Collection can provide a wrapper script that is visible to the system to enable the Software Collection, for example in the /usr/bin/ directory. In this case, ensure that the .pc files are visible to the system even if the Software Collection is disabled.
To allow your system to use .pc files from the disabled Software Collection, update the PKG_CONFIG_PATH environment variable with the paths to the .pc files associated with the Software Collection. Depending on what is defined in your .pc files, update the PKG_CONFIG_PATH environment variable for the %{_libdir} macro (which expands to the library directory), or for the %{_datadir} macro (which expands to the share directory).

Procedure 3.5. Updating the PKG_CONFIG_PATH environment variable for %{_libdir}

  1. To update the PKG_CONFIG_PATH environment variable for the %{_libdir} macro, create a custom script /etc/profile.d/name.sh. The script is preloaded when a shell is started on the system.
    For example, create the following file: 
    %{?scl_prefix}pc-libdir.sh
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  2. Use the pc-libdir.sh short script that modifies the PKG_CONFIG_PATH variable to refer to your .pc files: 
    export PKG_CONFIG_PATH="%{_libdir}/pkgconfig:/opt/provider/software_collection/path/to/your/pc_files"
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  3. Add the file to your Software Collection package's spec file: 
    SOURCE2: %{?scl_prefix}pc-libdir.sh
    Copy to Clipboard Toggle word wrap
  4. Install this file into the system /etc/profile.d/ directory by adjusting the %install section of the Software Collection package's spec file: 
    %install
install -p -c -m 644 %{SOURCE2} $RPM_BUILD_ROOT%{?scl:%_root_sysconfdir}%{!?scl:%_sysconfdir}/profile.d/
    Copy to Clipboard Toggle word wrap

Procedure 3.6. Updating the PKG_CONFIG_PATH environment variable for %{_datadir}

  1. To update the PKG_CONFIG_PATH environment variable for the %{_datadir} macro, create a custom script /etc/profile.d/name.sh. The script is preloaded when a shell is started on the system.
    For example, create the following file: 
    %{?scl_prefix}pc-datadir.sh
    Copy to Clipboard Toggle word wrap
  2. Use the pc-datadir.sh short script that modifies the PKG_CONFIG_PATH variable to refer to your .pc files: 
    export PKG_CONFIG_PATH="%{_datadir}/pkgconfig:/opt/provider/software_collection/path/to/your/pc_files"
    Copy to Clipboard Toggle word wrap
  3. Add the file to your Software Collection package's spec file: 
    SOURCE2: %{?scl_prefix}pc-datadir.sh
    Copy to Clipboard Toggle word wrap
  4. Install this file into the system /etc/profile.d/ directory by adjusting the %install section of the Software Collection package's spec file: 
    %install
install -p -c -m 644 %{SOURCE2} $RPM_BUILD_ROOT%{?scl:%_root_sysconfdir}%{!?scl:%_sysconfdir}/profile.d/
    Copy to Clipboard Toggle word wrap
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