clang only if we have clang

zsh/exports.zsh

@@ -21,7 +21,16 @@ export CLASSPATH="$CLASSPATH:$HOME/.java/packages/*:$HOME/.java/packages/lib/*:/
 export MATLABPATH=$HOME/.matlab2
 export GOPATH="$HOME/.config/go"
 
-# I want clang as default compiler
-export CC="clang"
-export CXX="clang++"
+# I want clang as default compiler if it exists
+command -v clang > /dev/null 2>&1
+if [ $? -eq 0 ]; then
+    export CC="clang"
+fi
+
+command -v clang++ > /dev/null 2>&1
+if [ $? -eq 0 ]; then
+    export CXX="clang++"
+fi
+
+# Wine Debug
 export WINEDEBUG=-all