Index: configure.ac
===================================================================
--- configure.ac.orig
+++ configure.ac
@@ -39,6 +39,7 @@ AC_PROG_CC
 AC_PROG_CXX
 AC_PROG_F77
 AC_PROG_CPP
+AC_PROG_OBJCXX
 AC_PROG_MAKE_SET
 SAH_LINKS
 AC_LANG_PUSH(C)
@@ -737,6 +738,8 @@ AM_CONDITIONAL(ENABLE_LIBRARIES, [test "
 AM_CONDITIONAL(INSTALL_HEADERS, [test "${enable_install_headers}" = yes])
 AM_CONDITIONAL(HAVE_CUDA_LIB, [test "${enable_client}" = yes -a -f ./coprocs/CUDA/posix/${boinc_platform}/libcudart.so])
 
+PKG_CHECK_MODULES([GTK2], [gtk+-2.0])
+
 dnl ======================================================================
 dnl some more vodoo required for building portable client-binary (client, clientgui)
 dnl ======================================================================
Index: clientgui/Makefile.am
===================================================================
--- clientgui/Makefile.am.orig
+++ clientgui/Makefile.am
@@ -118,9 +118,8 @@ EXTRA_DIST = *.h \
     ../lib/error_numbers.h \
     locale $(mac_headers)
 
-boincmgr_CPPFLAGS = $(AM_CPPFLAGS) $(WX_CPPFLAGS) $(SQLITE3_CPPFLAGS) $(LIBNOTIFY_CFLAGS) $(CLIENTGUIFLAGS) `pkg-config --cflags gtk+-2.0`
-boincmgr_CXXFLAGS = $(AM_CXXFLAGS) $(WX_CXXFLAGS) $(SQLITE3_CPPFLAGS) $(LIBNOTIFY_CFLAGS) $(CLIENTGUIFLAGS) `pkg-config --cflags gtk+-2.0`
-boincmgr_LDADD = $(LIBBOINC) $(SQLITE3_LIBS) $(LIBNOTIFY_LIBS) $(CLIENTGUILIBS) $(BOINC_EXTRA_LIBS) $(CLIENTLIBS)
+boincmgr_CPPFLAGS = $(AM_CPPFLAGS) $(WX_CPPFLAGS) $(SQLITE3_CPPFLAGS) $(LIBNOTIFY_CFLAGS) $(CLIENTGUIFLAGS) $(GTK2_CFLAGS)
+boincmgr_LDADD = $(LIBBOINC) $(SQLITE3_LIBS) $(LIBNOTIFY_LIBS) $(CLIENTGUILIBS) $(BOINC_EXTRA_LIBS) $(CLIENTLIBS) $(GTK2_LIBS)
 
 win_config.h: $(top_srcdir)/config.h
 	grep '#define.*BOINC.*VERSION' $^ > $@