Make the code build with another bunch of warning flags.

--HG--
extra : convert_revision : 1c5b66b58e4c66ff61e9cef2cb3760ac675c1626

bin/xbps-bin/main.c

@@ -27,6 +27,7 @@
 #include <stdbool.h>
 #include <stdlib.h>
 #include <string.h>
+#include <strings.h>
 #include <errno.h>
 #include <limits.h>
 #include <libgen.h>

bin/xbps-pkgdb/main.c

@@ -27,6 +27,7 @@
 #include <stdbool.h>
 #include <stdlib.h>
 #include <string.h>
+#include <strings.h>
 #include <errno.h>
 #include <limits.h>
 

bin/xbps-repo/main.c

@@ -27,6 +27,7 @@
 #include <stdbool.h>
 #include <stdlib.h>
 #include <string.h>
+#include <strings.h>
 #include <errno.h>
 #include <limits.h>
 #include <libgen.h>

lib/cmpver.c

@@ -19,6 +19,7 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
+#include <strings.h>
 #include <ctype.h>
 #include <xbps_api.h>
 

lib/fexec.c

@@ -35,6 +35,8 @@
 #include <unistd.h>
 #include <string.h>
 
+#include <xbps_api.h>
+
 static int	vfcexec(const char *, int, const char *, va_list);
 static int	pfcexec(const char *, const char *, const char **);
 

vars.mk

@@ -8,5 +8,7 @@ TOPDIR	?= ..
 INSTALL_STRIPPED ?= -s
 
 LDFLAGS += -L$(TOPDIR)/lib -L$(PREFIX)/lib -lxbps
-CPPFLAGS += -I$(TOPDIR)/include
-CFLAGS += -O2 -Wall -Wextra -Werror -fPIC -DPIC
+CPPFLAGS += -I$(TOPDIR)/include -D_XOPEN_SOURCE=600
+WARNFLAGS ?= -pedantic -std=c99 -Wall -Wextra -Werror -Wshadow -Wformat=2
+WARNFLAGS += -Wmissing-declarations -Wcomment -Wunused-macros -Wendif-labels
+CFLAGS += $(WARNFLAGS) -O2 -fPIC -DPIC