Create and install openblas.pc in cmake builds

CMakeLists.txt

@@ -227,3 +227,12 @@ install (FILES ${INCLUDE_FILES} DESTINATION include)
 if(NOT MSVC)
 	install (TARGETS ${OpenBLAS_LIBNAME}_static DESTINATION lib)
 endif()
+
+include(FindPkgConfig QUIET)
+if(PKG_CONFIG_FOUND)
+	set(prefix ${CMAKE_INSTALL_PREFIX})
+	set(libdir ${CMAKE_INSTALL_PREFIX}/lib)
+	set(includedir ${CMAKE_INSTALL_PREFIX}/include)
+	configure_file(${PROJECT_SOURCE_DIR}/cmake/openblas.pc.in ${PROJECT_BINARY_DIR}/openblas.pc @ONLY)
+	install (FILES ${PROJECT_BINARY_DIR}/openblas.pc DESTINATION lib/pkgconfig/)
+endif()