diff -Naur nx-libs-3.5.0.17.orig/nxcomp/Makefile.in nx-libs-3.5.0.17/nxcomp/Makefile.in
--- nx-libs-3.5.0.17.orig/nxcomp/Makefile.in	2013-01-09 15:03:33.152952758 +0100
+++ nx-libs-3.5.0.17/nxcomp/Makefile.in	2013-01-09 15:05:39.771898159 +0100
@@ -243,8 +243,8 @@
 
 $(LIBARCHIVE):	 $(CXXOBJ) $(COBJ)
 		 rm -f  $(LIBARCHIVE)
-		 ar clq $(LIBARCHIVE) $(CXXOBJ) $(COBJ)
-		 ranlib $(LIBARCHIVE)
+		 $(AR) $(LIBARCHIVE) $(CXXOBJ) $(COBJ)
+		 $(RANLIB) $(LIBARCHIVE)
 
 $(LIBCYGSHARED): $(LIBARCHIVE)
 		 $(CC) -shared -o $(LIBCYGSHARED) \
diff -Naur nx-libs-3.5.0.17.orig/nxcomp/configure.in nx-libs-3.5.0.17/nxcomp/configure.in
--- nx-libs-3.5.0.17.orig/nxcomp/configure.in	2013-01-09 15:03:33.151952758 +0100
+++ nx-libs-3.5.0.17/nxcomp/configure.in	2013-01-09 15:04:03.312940892 +0100
@@ -7,8 +7,7 @@
 
 dnl Set our default compilation flags.
 
-CXXFLAGS="$CXXFLAGS -O3 -fno-rtti -fno-exceptions"
-CFLAGS="$CFLAGS -O3"
+CXXFLAGS="$CXXFLAGS -fno-rtti -fno-exceptions"
 
 dnl Reset default linking directives.
 
diff -Naur nx-libs-3.5.0.17.orig/nxcompext/Makefile.in nx-libs-3.5.0.17/nxcompext/Makefile.in
--- nx-libs-3.5.0.17.orig/nxcompext/Makefile.in	2013-01-09 15:03:33.164952753 +0100
+++ nx-libs-3.5.0.17/nxcompext/Makefile.in	2013-01-09 15:06:08.747879052 +0100
@@ -125,8 +125,8 @@
 
 $(LIBARCHIVE):	 $(CXXOBJ) $(COBJ)
 		 rm -f  $(LIBARCHIVE)
-		 ar clq $(LIBARCHIVE) $(CXXOBJ) $(COBJ)
-		 ranlib $(LIBARCHIVE)
+		 $(AR) $(LIBARCHIVE) $(CXXOBJ) $(COBJ)
+		 $(RANLIB) $(LIBARCHIVE)
 
 $(LIBCYGSHARED): $(LIBARCHIVE)
 		 $(CC) -shared -o $(LIBCYGSHARED) \
diff -Naur nx-libs-3.5.0.17.orig/nxcompext/configure.in nx-libs-3.5.0.17/nxcompext/configure.in
--- nx-libs-3.5.0.17.orig/nxcompext/configure.in	2013-01-09 15:03:33.164952753 +0100
+++ nx-libs-3.5.0.17/nxcompext/configure.in	2013-01-09 15:04:16.247935801 +0100
@@ -5,11 +5,6 @@
 AC_INIT(NXlib.h)
 AC_PREREQ(2.13)
 
-dnl Reset default compilation flags.
-
-CXXFLAGS="$CXXFLAGS -O3"
-CFLAGS="$CFLAGS -O3"
-
 dnl Reset default linking directives.
 
 LIBSTATIC=""
diff -Naur nx-libs-3.5.0.17.orig/nxcompshad/Makefile.in nx-libs-3.5.0.17/nxcompshad/Makefile.in
--- nx-libs-3.5.0.17.orig/nxcompshad/Makefile.in	2013-01-09 15:03:33.163952754 +0100
+++ nx-libs-3.5.0.17/nxcompshad/Makefile.in	2013-01-09 15:06:16.933873660 +0100
@@ -158,8 +158,8 @@
 
 $(LIBARCHIVE):	$(CXXOBJ) $(COBJ)
 		rm -f  $(LIBARCHIVE)
-		ar clq $(LIBARCHIVE) $(CXXOBJ) $(COBJ)
-		ranlib $(LIBARCHIVE)
+		$(AR) $(LIBARCHIVE) $(CXXOBJ) $(COBJ)
+		$(RANLIB) $(LIBARCHIVE)
 
 $(LIBDLL): $(LIBARCHIVE)
 		$(CC) -o $@ \
diff -Naur nx-libs-3.5.0.17.orig/nxcompshad/configure.in nx-libs-3.5.0.17/nxcompshad/configure.in
--- nx-libs-3.5.0.17.orig/nxcompshad/configure.in	2013-01-09 15:03:33.163952754 +0100
+++ nx-libs-3.5.0.17/nxcompshad/configure.in	2013-01-09 15:04:20.073934295 +0100
@@ -5,11 +5,6 @@
 AC_INIT(Shadow.h)
 AC_PREREQ(2.13)
 
-dnl Reset default compilation flags.
-
-CXXFLAGS="$CXXFLAGS -O3"
-CPPFLAGS="$CPPFLAGS -O3"
-
 dnl Reset default linking directives.
 
 LIBSTATIC=""
diff -Naur nx-libs-3.5.0.17.orig/nxproxy/configure.in nx-libs-3.5.0.17/nxproxy/configure.in
--- nx-libs-3.5.0.17.orig/nxproxy/configure.in	2013-01-09 15:03:33.163952754 +0100
+++ nx-libs-3.5.0.17/nxproxy/configure.in	2013-01-09 15:04:24.842932418 +0100
@@ -5,11 +5,6 @@
 AC_INIT(Main.c)
 AC_PREREQ(2.13)
 
-dnl Reset default compilation flags.
-
-CXXFLAGS="$CXXFLAGS -O3"
-CPPFLAGS="$CPPFLAGS -O3"
-
 dnl Prefer headers and libraries from nx-X11 if present.
 
 if test -d "../nx-X11/exports/include" ; then