diff -rupN eigen-eigen-07105f7124f9/eigen3.pc.in eigen-eigen-07105f7124f9-new/eigen3.pc.in
--- eigen-eigen-07105f7124f9/eigen3.pc.in	2016-02-16 14:26:15.000000000 +0100
+++ eigen-eigen-07105f7124f9-new/eigen3.pc.in	2016-02-20 19:13:19.816842461 +0100
@@ -6,4 +6,4 @@ Description: A C++ template library for
 Requires:
 Version: @EIGEN_VERSION_NUMBER@
 Libs:
-Cflags: -I${prefix}/@INCLUDE_INSTALL_DIR@
+Cflags: -I@INCLUDE_INSTALL_DIR@