tidy up some existing packages and possibly fix gcc install

bash/Makefile

@@ -1,5 +1,6 @@
 prepare:
-	git clone https://git.savannah.gnu.org/git/bash.git && cd bash
+	git clone https://git.savannah.gnu.org/git/bash.git
+	cd bash
 bash:
 	make
 install:

flex/Makefile

@@ -7,6 +7,7 @@ make:
 		--prefix=/usr \
 		ac_cv_func_malloc_0_nonnull=yes \
 		ac_cv_func_realloc_0_nonnull=yes
+
 	make
 install:
 	make install DESTDIR="${PREFIX}"

gcc/Makefile

@@ -1,8 +1,11 @@
 prepare:
-	git clone git://gcc.gnu.org/git/gcc.git && cd gcc
+	git clone git://gcc.gnu.org/git/gcc.git
+	cd gcc
 gcc:
-        ./configure
+	mkdir build
+	cd build
+    ./configure --prefix=/usr --enable-languages=c,c++,d,fortran,go,objc,obj-c++
 install:
-	./install-sh
+	make install DESTDIR="${PREFIX}"
 uninstall:
 	rm -rf /usr/bin/gcc

zsh/Makefile

@@ -1,5 +1,6 @@
 prepare:
-	git clone https://github.com/zsh-users/zsh.git && cd zsh
+	git clone https://github.com/zsh-users/zsh.git
+	cd zsh
 zsh:
 	make
 install: