diff --git a/CMakeLists.txt b/CMakeLists.txt
index 8c5bd975..396e45bc 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -150,8 +150,16 @@ install(EXPORT      ${PROJECT_NAME}
 set(PACKAGE_NAME ${PROJECT_NAME})
 set(prefix ${CMAKE_INSTALL_PREFIX})
 set(exec_prefix ${CMAKE_INSTALL_PREFIX})
-set(includedir "\${prefix}/${CMAKE_INSTALL_INCLUDEDIR}")
-set(libdir "\${prefix}/${CMAKE_INSTALL_LIBDIR}")
+if (IS_ABSOLUTE "${CMAKE_INSTALL_INCLUDEDIR}")
+  set(includedir "${CMAKE_INSTALL_INCLUDEDIR}")
+else()
+  set(includedir "\${prefix}/${CMAKE_INSTALL_INCLUDEDIR}")
+endif()
+if (IS_ABSOLUTE "${CMAKE_INSTALL_LIBDIR}")
+  set(libdir "${CMAKE_INSTALL_LIBDIR}")
+else()
+  set(libdir "\${exec_prefix}/${CMAKE_INSTALL_LIBDIR}")
+endif()
 set(PACKAGE_VERSION "${PROJECT_VERSION}")
 configure_file(${CMAKE_CURRENT_LIST_DIR}/cglm.pc.in ${CMAKE_BINARY_DIR}/cglm.pc @ONLY)