diff --git a/gcc/config/rs6000/x-rs6000 b/gcc/config/rs6000/x-rs6000
new file mode 100644
index 00000000000..b47e77c480d
--- /dev/null
+++ b/gcc/config/rs6000/x-rs6000
@@ -0,0 +1,12 @@
+# configuration for IBM rs6000 running aix
+INSTALL=/usr/ucb/install -c
+
+# Show we need to use the C version of ALLOCA
+ALLOCA=alloca.o
+
+# We can't use -S to compile alloca
+ALLOCA_FLAGS=-c
+ALLOCA_FINISH=
+
+# For some reason, we need -lm for cc1.
+CLIB=-lm