--- a/lmfit.pc.in	2026-10-23 22:39:09.245775330 +0200
+++ b/lmfit.pc.in	2026-10-23 22:39:56.992195999 +0200
@@ -1,7 +1,7 @@
 prefix=@destination@
 exec_prefix=${prefix}
-libdir=${prefix}/lib
-includedir=${prefix}/include
+libdir=${prefix}/@CMAKE_INSTALL_LIBDIR@
+includedir=${prefix}/@CMAKE_INSTALL_INCLUDEDIR@
 
 Name: lmfit
 Description: Levenberg-Marquardt mean-squares minimization and curve fitting