Build failed on NetBSD/amd64.

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#   compile  pkg_select-20050315/ftpio.o
cc -O2 -g -g -I. -DPKGSRCBASE=\"/home/yui/pkgsrc/pkgsrc\" -DPKGDB=\"/var/db/pkg\" -DMAKE=\"/usr/bin/make\" -DCONFPATH=\"/usr/pkg/etc/pkg_select.conf\" -DMIRRORS=\"/usr/pkg/share/pkg_select\"  -Wall -Wstrict-prototypes -Wmissing-prototypes -Wpointer-arith -Wno-sign-compare -Wno-traditional -Wno-uninitialized -Wreturn-type -Wswitch -Wshadow -Wcast-qual -Wwrite-strings  -Werror       -c    ftpio.c
ftpio.c: In function `expect':
ftpio.c:353: warning: subscript has type `char'
*** Error code 1

Stop.
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I think we have two options.
Casting a variable to int in pkgselect source code or in ctype.h

Option #1 would be like this:
In ftpio.c file,
-                               if (ftprc && isdigit(buf[match.rm_so+1]))
+                               if (ftprc && isdigit((int)buf[match.rm_so+1]))

And here is option #2:
In /usr/src/include/ctype.h file,
-#define isdigit(c)      ((int)((_ctype_ + 1)[(c)] & _N))
+#define isdigit(c)      ((int)((_ctype_ + 1)[(int)(c)] & _N))


IMHO, testing if it is digit or not should be working on a character type.
Am I thinking wrong?