diff --git a/build.sh b/build.sh
index 4d9a9f5..639611f 100755
--- a/build.sh
+++ b/build.sh
@@ -81,6 +81,7 @@ mkdir -p $BUILD_DIR
 mkdir -p $TARGET_DIR
 mkdir -p $SDK_DIR
 
+set +e
 require $CC
 require $CXX
 require clang
@@ -92,6 +93,7 @@ require cpio
 require autogen
 require automake
 require libtool
+set -e
 
 CLANG_TARGET_OPTION=`./oclang/check_clang_target_option.sh`
 
diff --git a/build_gcc.sh b/build_gcc.sh
index 187f40f..de8c396 100755
--- a/build_gcc.sh
+++ b/build_gcc.sh
@@ -6,15 +6,15 @@ export LIBRARY_PATH=""
 export CC=clang
 export CXX=clang++
 
-which osxcross-conf || {
+which osxcross-conf &>/dev/null || {
     echo "you need to complete ./build.sh first, before you can start building gcc"
     exit 1
 }
 
-eval `osxcross-conf`
-
 set -e
 
+eval `osxcross-conf`
+
 # How many concurrent jobs should be used for compiling?
 JOBS=`grep -c ^processor /proc/cpuinfo`
 
@@ -35,7 +35,9 @@ function require
     done
 }
 
+set +e
 require wget
+set -e
 
 BASE_DIR=`pwd`