gpgme does not compile in El Captain

[promac@…]

:info:build In file included from gpgme-tool.c:36: :info:build /opt/local/include/argp.h:39:13: error: cannot combine with previous 'int' declaration specifier :info:build typedef int error_t; :info:build ^{:info:build ../config.h:258:17: note: expanded from macro 'error_t' :info:build #define error_t int :info:build} :info:build In file included from gpgme-tool.c:36: :info:build /opt/local/include/argp.h:39:1: warning: typedef requires a name [-Wmissing-declarations] :info:build typedef int error_t; :info:build ^{:info:build gpgme-tool.c:915:3: warning: implicitly declaring library function 'snprintf' with type 'int (char *, unsigned long, const char *, ...)' :info:build snprintf (code, sizeof (code) - 1, "0x%x", err); :info:build} :info:build gpgme-tool.c:915:3: note: include the header <stdio.h> or explicitly provide a declaration for 'snprintf' :info:build gpgme-tool.c:1736:9: warning: implicitly declaring library function 'strcasecmp' with type 'int (const char *, const char *)' :info:build if (! strcasecmp (name, gpgme_get_protocol_name (GPGME_PROTOCOL_OpenPGP))) :info:build ^{:info:build gpgme-tool.c:1736:9: note: include the header <strings.h> or explicitly provide a declaration for 'strcasecmp' :info:build gpgme-tool.c:2263:9: warning: implicitly declaring library function 'strncasecmp' with type 'int (const char *, const char *, unsigned long)' :info:build if (! strncasecmp (line, "file=", 5)) :info:build} :info:build gpgme-tool.c:2263:9: note: include the header <strings.h> or explicitly provide a declaration for 'strncasecmp' :info:build gpgme-tool.c:2266:19: warning: implicitly declaring library function 'strdup' with type 'char *(const char *)' :info:build *filename = strdup (line + 5);