--- a/gps/Makefile	2018-07-09 20:27:34.950424490 +0200
+++ b/gps/Makefile	2018-07-09 20:37:39.510558817 +0200
@@ -47,7 +47,8 @@
 	for f in ../kernel/generated/*; do cat $$f | tr -d '\015' > $$f-aux; mv -f $$f-aux $$f; done
 endif
 	$(GPRBUILD) $(GPRBUILD_FLAGS) -m -p -ws \
-	  $(GPRBUILD_BUILD_TYPE_FLAGS) -Pgps -largs `pkg-config gmodule-2.0 --libs`
+	  $(GPRBUILD_BUILD_TYPE_FLAGS) -Pgps -largs `pkg-config gmodule-2.0 --libs` -lpython2.7 \
+    -cargs:Ada ${ADAFLAGS} -cargs:C ${CFLAGS}
 
 resources:
 ifeq ($(OS),Windows_NT)
--- a/Makefile.in	2018-07-09 21:51:08.422550386 +0200
+++ b/Makefile.in	2018-07-09 21:51:32.187225891 +0200
@@ -10,7 +10,7 @@
 INSTALL_PROGRAM = @INSTALL_PROGRAM@
 INSTALL_DATA    = @INSTALL_DATA@
 GNATCOLL_INSTALL  = @GNATCOLL_INSTALL@
-prefix          = @prefix@
+prefix          = $(DESTDIR)@prefix@
 bindir          = $(prefix)/bin
 sharedir        = $(prefix)/share
 examplesdir     = $(prefix)/share/examples/gps
--- a/docs/Makefile.in	2018-07-09 21:53:33.074572729 +0200
+++ b/docs/Makefile.in	2018-07-09 21:53:52.149311484 +0200
@@ -1,4 +1,4 @@
-prefix = @prefix@
+prefix = $(DESTDIR)@prefix@
 docdir = $(prefix)/share/doc/gps
 sharedir = $(prefix)/share/gps
 
--- a/share/support/core/toolchains.py	2018-07-11 12:15:18.758674244 +0200
+++ b/share/support/core/toolchains.py	2018-07-11 12:20:20.389220849 +0200
@@ -16,11 +16,11 @@
        nullified by using an empty value in the corresponding tag
   -->
   <toolchain_default>
-    <gnat_driver>gnat</gnat_driver>
-    <gnat_list>gnatls</gnat_list>
+    <gnat_driver>@GNAT@</gnat_driver>
+    <gnat_list>@GNATLS@</gnat_list>
     <debugger>gdb</debugger>
     <cpp_filt>c++filt</cpp_filt>
-    <compiler lang="ada">gnatmake</compiler>
+    <compiler lang="ada">@GNATMAKE@</compiler>
     <compiler lang="c">gcc</compiler>
     <compiler lang="c++">g++</compiler>
     <compiler lang="asm">gcc</compiler>
--- a/share/support/core/projects.py	2018-07-11 13:49:29.631289680 +0200
+++ b/share/support/core/projects.py	2018-07-11 13:51:46.568252607 +0200
@@ -146,7 +146,7 @@
           <string />
        </index>
        <specialized_index value="Ada">
-          <choice default="true" >gnatmake</choice>
+          <choice default="true" >@GNATMAKE@</choice>
        </specialized_index>
    </project_attribute>
 
@@ -166,7 +166,7 @@
        description="The gnatls command used to find where the Ada run time files are installed (including optional arguments, e.g. gnatls --RTS=sjlj)."
        hide_in="all"
        label="Gnatls">
-       <choice default="true" >gnatls</choice>
+       <choice default="true" >@GNATLS@</choice>
        <string />
    </project_attribute>
 
@@ -178,7 +178,7 @@
        description="The gnat driver used to run the various commands associated with the GNAT toolchain."
        hide_in="all"
        label="Gnat">
-       <choice default="true" >gnat</choice>
+       <choice default="true" >@GNAT@</choice>
        <string />
    </project_attribute>
 
--- a/gnatcoll_extras/gnatcoll_extras.gpr	2018-07-22 14:42:17.618161040 +0200
+++ b/gnatcoll_extras/gnatcoll_extras.gpr	2018-07-22 14:43:33.973070921 +0200
@@ -14,6 +14,7 @@
       for Switches ("C") use
         ("-g", "-O2")
         & Shared.Gtk_Cflags & Shared.Pygobject_Include & Shared.Python_Cflags;
+      for Driver ("C") use External ("CC", "gcc");
    end Compiler;
 
 end GNATCOLL_Extras;
--- a/widgets/widgets.gpr	2018-07-22 21:46:23.907355738 +0200
+++ b/widgets/widgets.gpr	2018-07-22 21:47:02.673825994 +0200
@@ -14,6 +14,7 @@
       for Switches ("C") use
         ("-g", "-O2")
         & Shared.Gtk_Cflags;
+      for Driver ("C") use External ("CC", "gcc");
    end Compiler;
 
 end Widgets;
--- a/common/common.gpr.in	2018-07-25 08:05:45.227060250 +0200
+++ b/common/common.gpr.in	2018-07-25 08:06:55.067009811 +0200
@@ -23,6 +23,7 @@
              for Switches ("dynamic_arrays.adb") use No_Checks;
           when "Debug" =>
       end case;
+      for Driver ("C") use External ("CC", "gcc");
    end Compiler;
 
    package Binder is
--- a/shared.gpr.in	2018-07-25 08:11:47.317597391 +0200
+++ b/shared.gpr.in	2018-07-25 08:10:56.774362671 +0200
@@ -60,6 +60,7 @@
                );
             for Switches ("C") use Optimize & ("-g", "-O2");
       end case;
+      for Driver ("C") use External ("CC", "gcc");
    end Compiler;
 
    package Binder is