diff --git a/configure.in b/configure.in
index 2c97da1..ce44e03 100755
--- a/configure.in
+++ b/configure.in
@@ -36,6 +36,18 @@ fi
 
 AC_SUBST(VERSIONEXT)
 
+case $host in
+  arm*-*-linux-gnu*)
+    AC_SUBST(ARCH_DEFINES, "-D_ARMEL")
+    ;;
+  powerpc-*-linux-gnu*)
+    AC_SUBST(ARCH_DEFINES, "-D_POWERPC")
+    ;;
+  powerpc64-*-linux-gnu*)
+    AC_SUBST(ARCH_DEFINES, "-D_POWERPC64")
+    ;;
+esac
+
 # Finally create all the generated files
 AC_OUTPUT([
 Makefile
diff --git a/src/xvdr/Makefile.am b/src/xvdr/Makefile.am
index e97633a..d52d8af 100644
--- a/src/xvdr/Makefile.am
+++ b/src/xvdr/Makefile.am
@@ -45,6 +45,9 @@ libxvdr_la_LIBADD = \
 	../libTcpSocket/libTcpSocket.la \
 	$(ZLIB_LIBS)
 
+CPPFLAGS = \
+	$(ARCH_DEFINES)
+
 INCLUDES = -I$(srcdir)/.. -I$(srcdir)/../.. -I$(srcdir)/../../include -DUSE_DEMUX -D__STDC_CONSTANT_MACROS -D_LINUX
 
 EXTRA_DIST = \