diff -up ./ccd.pc.in.pkgconfig ./ccd.pc.in
--- ./ccd.pc.in.pkgconfig	2020-04-18 13:59:50.548416479 -0400
+++ ./ccd.pc.in	2020-04-18 14:00:11.487751430 -0400
@@ -3,7 +3,7 @@
 prefix=@CMAKE_INSTALL_PREFIX@
 exec_prefix=${prefix}
 libdir=${prefix}/@CMAKE_INSTALL_LIBDIR@
-includedir=${prefix}/@CMAKE_INSTALL_INCLUDEDIR@
+includedir=${prefix}/@CMAKE_INSTALL_INCLUDEDIR@/ccd
 
 Name: @PROJECT_NAME@
 Description: @CCD_PKGCONFIG_DESCRIPTION@