diff --git a/ctest/Makefile b/ctest/Makefile
index af5b34a36..ad960b35a 100644
--- a/ctest/Makefile
+++ b/ctest/Makefile
@@ -218,6 +218,9 @@ ifeq ($(F_COMPILER), IBM)
 ifeq ($(C_COMPILER), GCC)
 CEXTRALIB += -lgomp
 endif
+ifeq ($(C_COMPILER), CLANG)
+CEXTRALIB += -lomp
+endif
 endif
 endif
 
diff --git a/test/Makefile b/test/Makefile
index 56acf1c5b..5a4694ce6 100644
--- a/test/Makefile
+++ b/test/Makefile
@@ -276,6 +276,9 @@ ifeq ($(F_COMPILER), IBM)
 ifeq ($(C_COMPILER), GCC)
 CEXTRALIB += -lgomp
 endif
+ifeq ($(C_COMPILER), CLANG)
+CEXTRALIB += -lomp
+endif
 endif
 endif
 
diff --git a/utest/Makefile b/utest/Makefile
index 8acaa3ea9..ac58d6f12 100644
--- a/utest/Makefile
+++ b/utest/Makefile
@@ -45,8 +45,18 @@ endif
 
 all : run_test
 
+ifeq ($(OSNAME), AIX)
+ifeq ($(USE_OPENMP), 1)
+$(UTESTBIN): $(OBJS)
+	$(CC) $(CFLAGS) $(LDFLAGS) -o $@ $^ ../$(LIBNAME) $(EXTRALIB)
+else
 $(UTESTBIN): $(OBJS)
 	$(CC) $(CFLAGS) $(LDFLAGS) -o $@ $^ ../$(LIBNAME) $(EXTRALIB) $(FEXTRALIB)
+endif
+else
+$(UTESTBIN): $(OBJS)
+	$(CC) $(CFLAGS) $(LDFLAGS) -o $@ $^ ../$(LIBNAME) $(EXTRALIB) $(FEXTRALIB)
+endif
 
 run_test: $(UTESTBIN)
 ifneq ($(CROSS), 1)