diff --git a/libowlps-client/Makefile b/libowlps-client/Makefile
index f364436..1fa2642 100644
--- a/libowlps-client/Makefile
+++ b/libowlps-client/Makefile
@@ -1,7 +1,9 @@
 # Compiler
-COLORGCC := $(shell which colorgcc >/dev/null 2>&1 ; echo $$?)
-ifeq ($(COLORGCC), 0)
-	CC = colorgcc
+ifeq "$(origin CC)" "default"
+	COLORGCC := $(shell which colorgcc >/dev/null 2>&1 ; echo $$?)
+	ifeq "$(COLORGCC)" "0"
+		CC = colorgcc
+	endif
 endif
 
 # Other tools
diff --git a/libowlps-resultreader/Makefile b/libowlps-resultreader/Makefile
index a9ad8f6..e73d80d 100644
--- a/libowlps-resultreader/Makefile
+++ b/libowlps-resultreader/Makefile
@@ -1,7 +1,9 @@
 # Compiler
-COLORGCC := $(shell which colorgcc >/dev/null 2>&1 ; echo $$?)
-ifeq ($(COLORGCC), 0)
-	CC = colorgcc
+ifeq "$(origin CC)" "default"
+	COLORGCC := $(shell which colorgcc >/dev/null 2>&1 ; echo $$?)
+	ifeq "$(COLORGCC)" "0"
+		CC = colorgcc
+	endif
 endif
 
 # Other tools
diff --git a/libowlps/Makefile b/libowlps/Makefile
index d9829ab..e8a0f55 100644
--- a/libowlps/Makefile
+++ b/libowlps/Makefile
@@ -5,9 +5,11 @@ INSTALL_INC= $(PREFIX)/include
 INSTALL_MAN= $(PREFIX)/share/man
 
 # Compiler
-COLORGCC := $(shell which colorgcc >/dev/null 2>&1 ; echo $$?)
-ifeq ($(COLORGCC), 0)
-	CC = colorgcc
+ifeq "$(origin CC)" "default"
+	COLORGCC := $(shell which colorgcc >/dev/null 2>&1 ; echo $$?)
+	ifeq "$(COLORGCC)" "0"
+		CC = colorgcc
+	endif
 endif
 
 # Other tools
diff --git a/owlps-aggregator/Makefile b/owlps-aggregator/Makefile
index 4f9d0ee..8c8872a 100644
--- a/owlps-aggregator/Makefile
+++ b/owlps-aggregator/Makefile
@@ -11,9 +11,11 @@ INSTALL_INC= $(PREFIX)/include
 INSTALL_MAN= $(PREFIX)/share/man
 
 # Compiler
-COLORGCC := $(shell which colorgcc >/dev/null 2>&1 ; echo $$?)
-ifeq ($(COLORGCC), 0)
-	CC = colorgcc
+ifeq "$(origin CC)" "default"
+	COLORGCC := $(shell which colorgcc >/dev/null 2>&1 ; echo $$?)
+	ifeq "$(COLORGCC)" "0"
+		CC = colorgcc
+	endif
 endif
 
 # Install/uninstall commands
diff --git a/owlps-client/Makefile b/owlps-client/Makefile
index b5b753c..b96a413 100644
--- a/owlps-client/Makefile
+++ b/owlps-client/Makefile
@@ -11,9 +11,11 @@ INSTALL_INC= $(PREFIX)/include
 INSTALL_MAN= $(PREFIX)/share/man
 
 # Compiler
-COLORGCC := $(shell which colorgcc >/dev/null 2>&1 ; echo $$?)
-ifeq ($(COLORGCC), 0)
-	CC = colorgcc
+ifeq "$(origin CC)" "default"
+	COLORGCC := $(shell which colorgcc >/dev/null 2>&1 ; echo $$?)
+	ifeq "$(COLORGCC)" "0"
+		CC = colorgcc
+	endif
 endif
 
 # Install/uninstall commands
diff --git a/owlps-listener/Makefile b/owlps-listener/Makefile
index c8c6f56..15449a1 100644
--- a/owlps-listener/Makefile
+++ b/owlps-listener/Makefile
@@ -11,9 +11,11 @@ INSTALL_INC= $(PREFIX)/include
 INSTALL_MAN= $(PREFIX)/share/man
 
 # Compiler
-COLORGCC := $(shell which colorgcc >/dev/null 2>&1 ; echo $$?)
-ifeq ($(COLORGCC), 0)
-	CC = colorgcc
+ifeq "$(origin CC)" "default"
+	COLORGCC := $(shell which colorgcc >/dev/null 2>&1 ; echo $$?)
+	ifeq "$(COLORGCC)" "0"
+		CC = colorgcc
+	endif
 endif
 
 # Install/uninstall commands
diff --git a/owlps-positioning/Makefile b/owlps-positioning/Makefile
index 66cd3e3..c8f0534 100644
--- a/owlps-positioning/Makefile
+++ b/owlps-positioning/Makefile
@@ -26,9 +26,11 @@ CPPCHECK = cppcheck --quiet --enable=all
 DOXYGEN = OWLPS_VERSION=$(OWLPS_VERSION) doxygen >/dev/null
 
 # Compilation tools
-COLORGCC := $(shell which colorgcc >/dev/null 2>&1 ; echo $$?)
-ifeq ($(COLORGCC), 0)
-	CXX = colorgcc
+ifeq "$(origin CXX)" "default"
+	COLORGCC := $(shell which colorgcc >/dev/null 2>&1 ; echo $$?)
+	ifeq "$(COLORGCC)" "0"
+		CXX = colorgcc
+	endif
 endif
 
 # Flags
diff --git a/owlps-udp-to-http/Makefile b/owlps-udp-to-http/Makefile
index 6951855..f487da4 100644
--- a/owlps-udp-to-http/Makefile
+++ b/owlps-udp-to-http/Makefile
@@ -11,9 +11,11 @@ INSTALL_INC= $(PREFIX)/include
 INSTALL_MAN= $(PREFIX)/share/man
 
 # Compiler
-COLORGCC := $(shell which colorgcc >/dev/null 2>&1 ; echo $$?)
-ifeq ($(COLORGCC), 0)
-	CC = colorgcc
+ifeq "$(origin CC)" "default"
+	COLORGCC := $(shell which colorgcc >/dev/null 2>&1 ; echo $$?)
+	ifeq "$(COLORGCC)" "0"
+		CC = colorgcc
+	endif
 endif
 
 # Install/uninstall commands