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Taken from: https://groups.google.com/g/linux.debian.bugs.dist/c/mX4GpUJih4k.
--- a/configure.ac
+++ b/configure.ac
@@ -132,6 +132,16 @@ if test "$os_unix" = "yes"; then
AC_CHECK_FUNCS([getpeereid])
AC_CHECK_FUNCS([getpeerucred])
AC_CHECK_FUNCS([issetugid])
+ case "$host_os" in
+ kfreebsd*-gnu | gnu*)
+ have_getpeereid=no
+ AC_CHECK_LIB(bsd, getpeereid, have_getpeereid=yes)
+ if test "x$have_getpeereid" = "xyes"; then
+ AC_DEFINE([HAVE_GETPEEREID], [1], [have getpeereid])
+ AC_SEARCH_LIBS([getpeereid], [bsd])
+ fi
+ ;;
+ esac
AC_CACHE_CHECK([for thread-local storage class],
[ac_cv_tls_keyword],
--- a/common/unix-peer.c
+++ b/common/unix-peer.c
@@ -47,6 +47,11 @@
# include <ucred.h>
#endif
+#ifdef HAVE_GETPEEREID
+/* Declare getpeereid from /usr/include/bsd/unistd.h */
+extern int getpeereid(int s, uid_t *euid, gid_t *egid);
+#endif
+
/* Returns the unix domain socket peer information.
* Returns zero on success.
*/
@@ -73,7 +78,8 @@ p11_get_upeer_id (int cfd, uid_t *uid, u
*pid = cr.pid;
#elif defined(HAVE_GETPEEREID)
- /* *BSD/MacOSX */
+ /* *BSD/MacOSX/kFreeBSD/Hurd */
+
uid_t euid;
gid_t egid;
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