Patched to compile with GCC 10

Makefile

 all:
 	tar xf gdbm-1.18.1.tar.gz
+	patch -Np1 -d gdbm-1.18.1 < gdbm-1.18.1-gcc10.patch
 	cd gdbm-1.18.1 && ./configure --build=$(CLFS_TARGET) --prefix=/usr --disable-static --enable-libgdbm-compat
 	$(MAKE) -C gdbm-1.18.1
 	if [[ ! "$(BUILD_OPTIONS)" =~ no-tests ]] ; then \

gdbm-1.18.1-gcc10.patch

+diff -uNr gdbm-1.18.1/src/parseopt.c gdbm-1.18.1-gcc10/src/parseopt.c
+--- gdbm-1.18.1/src/parseopt.c	2018-05-30 19:09:15.000000000 +0930
++++ gdbm-1.18.1-gcc10/src/parseopt.c	2020-07-10 23:05:27.873819654 +0930
+@@ -255,8 +255,6 @@
+ }
+ 
+ char *parseopt_program_name;
+-char *parseopt_program_doc;
+-char *parseopt_program_args;
+ const char *program_bug_address = "<" PACKAGE_BUGREPORT ">";
+ void (*parseopt_help_hook) (FILE *stream);
+