[gcc-build] cd back to PWD

gcc-build.sh

@@ -28,13 +28,11 @@ export CPLUS_INCLUDE_PATH
 
 tar jxf $TAR_FILE || error_exit "Extracting GCC failed. Abort."
 mv $INST_DIR $SRC
-
-(cd $SRC && ./contrib/download_prerequisites > prerequisite.log) || error_exit "Download prerequisite failed. Abort."
+(cd $SRC && (./contrib/download_prerequisites > prerequisite.log || error_exit "Download prerequisite failed. Abort.") && cd -)
 
 mkdir $INST_DIR
 cd $INST_DIR
 
-
 ../$SRC/configure --enable-languages=c,c++,fortran --disable-multilib -prefix=$PREFIX > configure.log || error_exit "Configuration failed. Abort."
 make $MAKE_FLAGS -s V=0 > make.log || error_exit "Make failed. Abort."