Use the variable in the scan-build install script.

scan-build-install.sh

@@ -4,13 +4,12 @@ CLANG_CHECKER_NAME=checker-278
 
 cd ~
 
-if [ ! -d checker-278 ]
+if [ ! -d ~/$CLANG_CHECKER_NAME ]
 then
-  curl http://clang-analyzer.llvm.org/downloads/checker-278.tar.bz2 -o ~/$CLANG_CHECKER_NAME.tar.bz2
+  curl http://clang-analyzer.llvm.org/downloads/$CLANG_CHECKER_NAME.tar.bz2 -o ~/$CLANG_CHECKER_NAME.tar.bz2
   tar -xf ~/$CLANG_CHECKER_NAME.tar.bz2
 fi
 
 export SCAN_BUILD_PATH=~/$CLANG_CHECKER_NAME/bin/scan-build
-export PATH=$PATH:$SCAN_BUILD_PATH/bin
 
 cd -