diff --git a/Configure b/Configure
index 5a02aa4ff..fc694cbd3 100755
--- a/Configure
+++ b/Configure
@@ -345,6 +345,8 @@ my %table=(
 # IBM's AIX.
 "aix-cc",   "cc:-O -DB_ENDIAN -qmaxmem=16384::(unknown):AIX::BN_LLONG RC4_CHAR:::",
 "aix-gcc",  "gcc:-O3 -DB_ENDIAN::(unknown):AIX::BN_LLONG RC4_CHAR:::",
+"aix43-cc",   "cc:-O -DAIX -DB_ENDIAN -qmaxmem=16384::(unknown)::BN_LLONG RC4_CHAR::::::::::dlfcn:",
+"aix43-gcc",  "gcc:-O3 -DAIX -DB_ENDIAN::(unknown)::BN_LLONG RC4_CHAR::::::::::dlfcn:",
 
 #
 # Cray T90 (SDSC)
diff --git a/config b/config
index 2d363d80e..db0046f3d 100755
--- a/config
+++ b/config
@@ -104,6 +104,14 @@ case "${SYSTEM}:${RELEASE}:${VERSION}:${MACHINE}" in
 	echo "m68k-apple-aux3"; exit 0
 	;;
 
+    AIX:[3456789]:4:*)
+	echo "${MACHINE}-ibm-aix43"; exit 0
+	;;
+
+    AIX:*:[56789]:*)
+	echo "${MACHINE}-ibm-aix43"; exit 0
+	;;
+
     AIX:*)
 	echo "${MACHINE}-ibm-aix"; exit 0
 	;;