On OpenBSD, the OS headers include sys/ucred.h through sys/mount.h.
For this to work, conftest needs to include sys/param.h before sys/mount.h
to get the definition for NGROUPS. I'm not sure if NetBSD also requires this,
or not. It seems like an odd dependency.
configure: WARNING: sys/mount.h: present but cannot be compiled
configure: WARNING: sys/mount.h: check for missing prerequisite headers?
configure: WARNING: sys/mount.h: see the Autoconf documentation
configure: WARNING: sys/mount.h: section "Present But Cannot Be Compiled"
configure: WARNING: sys/mount.h: proceeding with the preprocessor's result
configure: WARNING: sys/mount.h: in the future, the compiler will take
precedence
configure: WARNING: ## --------------------------------------------- ##
configure: WARNING: ## Report this to varnish-dev@projects.linpro.no ##
configure: WARNING: ## --------------------------------------------- ##
---
configure:20770: checking sys/mount.h usability
configure:20787: gcc -c -g -O2 conftest.c >&5
In file included from /usr/include/sys/mount.h:40,
from conftest.c:59:
/usr/include/sys/ucred.h:46: error: `NGROUPS' undeclared here (not in a
function)
configure:20793: $? = 1
configure: failed program was:
| /* confdefs.h. */
| #define PACKAGE_NAME "Varnish"
| #define PACKAGE_TARNAME "varnish"
| #define PACKAGE_VERSION "1.1.2"
| #define _GNU_SOURCE 1
| #define STDC_HEADERS 1
| #define HAVE_SYS_TYPES_H 1
| #define HAVE_SYS_STAT_H 1
| #define HAVE_STDLIB_H 1
| #define HAVE_STRING_H 1
| #define HAVE_MEMORY_H 1
| #define HAVE_STRINGS_H 1
| #define HAVE_INTTYPES_H 1
| #define HAVE_STDINT_H 1
| #define HAVE_UNISTD_H 1
| #define HAVE_DLFCN_H 1
| #define STDC_HEADERS 1
| #define HAVE_SYS_WAIT_H 1
| #define TIME_WITH_SYS_TIME 1
| #define HAVE_SYS_SOCKET_H 1
| /* end confdefs.h. */
| #include <stdio.h>
| #ifdef HAVE_SYS_TYPES_H
| # include <sys/types.h>
| #endif
| #ifdef HAVE_SYS_STAT_H
| # include <sys/stat.h>
| #endif
| #ifdef STDC_HEADERS
| # include <stdlib.h>
| # include <stddef.h>
| #else
| # ifdef HAVE_STDLIB_H
| # include <stdlib.h>
| # endif
| #endif
| #ifdef HAVE_STRING_H
| # if !defined STDC_HEADERS && defined HAVE_MEMORY_H
| # include <memory.h>
| # endif
| # include <string.h>
| #endif
| #ifdef HAVE_STRINGS_H
| # include <strings.h>
| #endif
| #ifdef HAVE_INTTYPES_H
| # include <inttypes.h>
| #endif
| #ifdef HAVE_STDINT_H
| # include <stdint.h>
| #endif
| #ifdef HAVE_UNISTD_H
| # include <unistd.h>
| #endif
| #include <sys/mount.h>
configure:20807: result: no
configure:20811: checking sys/mount.h presence
configure:20826: gcc -E conftest.c
configure:20832: $? = 0
configure:20846: result: yes
configure:20859: WARNING: sys/mount.h: present but cannot be compiled
configure:20861: WARNING: sys/mount.h: check for missing prerequisite
headers?
configure:20863: WARNING: sys/mount.h: see the Autoconf documentation
configure:20865: WARNING: sys/mount.h: section "Present But Cannot Be
Compiled"
configure:20867: WARNING: sys/mount.h: proceeding with the preprocessor's
resultconfigure:20869: WARNING: sys/mount.h: in the future, the compiler will
take precedence
configure:20879: checking for sys/mount.h
configure:20887: result: yes
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