add a pkg-config file

CMakeLists.txt

@@ -17,7 +17,10 @@ if (POLICY CMP0127)
     cmake_policy(SET CMP0127 NEW)
 endif()
 
-project(base64 LANGUAGES C VERSION 0.5.1)
+project(base64 LANGUAGES C
+    VERSION 0.5.1
+    DESCRIPTION "Fast Base64 stream encoder/decoder in C99, with SIMD acceleration"
+)
 
 include(GNUInstallDirs)
 include(CMakeDependentOption)
@@ -239,6 +242,10 @@ if (BASE64_BUILD_TESTS)
     add_subdirectory(test)
 endif()
 
+########################################################################
+# pkg-config file
+configure_file("${CMAKE_CURRENT_LIST_DIR}/cmake/base64.pc.in" "${CMAKE_CURRENT_BINARY_DIR}/base64.pc" @ONLY)
+
 ########################################################################
 # base64
 if (BASE64_BUILD_CLI)
@@ -280,6 +287,10 @@ install(FILES
         "${CMAKE_CURRENT_BINARY_DIR}/base64-config-version.cmake"
     DESTINATION "${CMAKE_INSTALL_LIBDIR}/cmake/${PROJECT_NAME}"
 )
+install(FILES
+        "${CMAKE_CURRENT_BINARY_DIR}/base64.pc"
+    DESTINATION "${CMAKE_INSTALL_LIBDIR}/pkgconfig"
+)
 
 install(EXPORT base64-targets
     NAMESPACE aklomp::

cmake/base64.pc.in

@@ -0,0 +1,10 @@
+prefix="@CMAKE_INSTALL_PREFIX@"
+exec_prefix="${prefix}"
+libdir="${prefix}/lib"
+includedir="${prefix}/include"
+
+Name: @PROJECT_NAME@
+Description: @CMAKE_PROJECT_DESCRIPTION@
+Version: @PROJECT_VERSION@
+Cflags: -I${includedir}
+Libs: -L${libdir} -l@PROJECT_NAME@