diff -rupN eigen-eigen-323c052e1731/eigen3.pc.in eigen-eigen-323c052e1731-new/eigen3.pc.in

--- eigen-eigen-323c052e1731/eigen3.pc.in	2018-12-11 18:57:55.000000000 +0100

+++ eigen-eigen-323c052e1731-new/eigen3.pc.in	2018-12-25 23:10:48.594420575 +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@