diff --git a/Reducibility_Multiplex/Makefile b/Reducibility_Multiplex/Makefile
index 40293cb..01e71fa 100644
--- a/Reducibility_Multiplex/Makefile
+++ b/Reducibility_Multiplex/Makefile
@@ -2,25 +2,30 @@ CC=gcc
 CFLAGS=-O2 
 LDFLAGS=-lm -lgmp -lz
 
-IS_CC_GCC=$(shell $(CC) --version | grep -Eic 'gcc')
-IS_CC_CLANG=$(shell $(CC) --version | grep -Eic '(llvm|clang)')
-IS_CC_ICC=$(shell $(CC) --version | grep -Eic 'Intel')
+HAVE_CC=$(shell $(CC) --version ; echo \$?)
+
+IS_CC_GCC=$(shell $(CC) --version | grep -Eic 'gcc' || echo "0")
+IS_CC_CLANG=$(shell $(CC) --version | grep -Eic '(llvm|clang)' || echo "0") 
+IS_CC_ICC=$(shell $(CC) --version | grep -Eic 'Intel' || echo "0")
+
 
 ifeq ($(IS_CC_GCC), 1)
+# compiler is GCC
 	CFLAGS+=-fopenmp
 else
-    ifneq ($(IS_CC_CGLANG), 0)
+    ifeq ($(IS_CC_CGLANG), 1)
+# compiler is CLANG
 	LDFLAGS+=-lomp
+    else 
+         ifeq ($(IS_CC_ICC), 1)
+# compiler is Intel icc
+		CFLAGS+=-qopenmp
+         endif
     endif
-#else 
-#    ifeq ($(IS_CC_ICC), 1)
-#
-#    endif
-
 endif
 
 
-all: reducibility
+all: reducibility_complexity
 
 clean:
 	rm -f reducibility_complexity