--- plplot-5.11.1/cmake/modules/instdirs.cmake.orig	2016-03-10 21:57:48.161215537 +0100
+++ plplot-5.11.1/cmake/modules/instdirs.cmake	2016-03-10 22:00:46.011208074 +0100
@@ -100,11 +100,13 @@
 
 # Ada source files (*.adb, *.ads) (following recommendations in
 # http://www.ada-france.org/debian/debian-ada-policy.html
-set(ADA_INCLUDE_DIR ${CMAKE_INSTALL_DATADIR}/ada/adainclude/plplotada)
+set(ADA_INCLUDE_PATH ${CMAKE_INSTALL_DATADIR}/ada/adainclude CACHE PATH "Ada include path")
+set(ADA_INCLUDE_DIR ${ADA_INCLUDE_PATH}/plplotada)
 
 # Ada library information files (*.ali) (following recommendations in
 # http://www.ada-france.org/debian/debian-ada-policy.html
-set(ADA_LIB_DIR ${CMAKE_INSTALL_LIBDIR}/ada/adalib/plplotada)
+set(ADA_LIB_PATH ${CMAKE_INSTALL_LIBDIR}/ada/adalib CACHE PATH "Ada library path")
+set(ADA_LIB_DIR ${ADA_LIB_PATH}/plplotada)
 
 # Drivers.
 set(DRV_DIR ${CMAKE_INSTALL_LIBDIR}/${PACKAGE}${PLPLOT_VERSION}/drivers)