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commit 13d9e0c5a7e03559a2b5bf405b526098b15bd0e6
Author: Alexander Barton 
Date:   Sun Nov 6 14:16:59 2011 +0100

    Test for gai_strerror()

    If gai_strerror() isn't available, use a macro that simply returns
    a static error message (regardless of the real error code).

    For example, GNU libc 2.0.7 doesn't implement gai_strerror().

diff --git a/configure.in b/configure.in

--- a/configure.in
+++ b/configure.in
@@ -160,10 +160,12 @@ AC_FUNC_STRFTIME

 AC_CHECK_FUNCS([ \
 	bind gethostbyaddr gethostbyname gethostname inet_ntoa \
-	setsid setsockopt socket strcasecmp waitpid],,AC_MSG_ERROR([required function missing!]))
+	setsid setsockopt socket strcasecmp waitpid],,
+	AC_MSG_ERROR([required function missing!]))

-AC_CHECK_FUNCS(getaddrinfo getnameinfo inet_aton sigaction sigprocmask snprintf \
- vsnprintf strdup strlcpy strlcat strtok_r)
+AC_CHECK_FUNCS([ \
+	gai_strerror getaddrinfo getnameinfo inet_aton sigaction \
+	sigprocmask snprintf vsnprintf strdup strlcpy strlcat strtok_r])

 # -- Configuration options --

diff --git a/src/portab/portab.h b/src/portab/portab.h

--- a/src/portab/portab.h
+++ b/src/portab/portab.h
@@ -164,6 +164,10 @@ extern char * strtok_r PARAMS((char *str, const char *delim, char **saveptr));
 extern int vsnprintf PARAMS(( char *str, size_t count, const char *fmt, va_list args ));
 #endif

+#ifndef HAVE_GAI_STRERROR
+#define gai_strerror(r) "unknown error"
+#endif
+
 #ifndef PACKAGE_NAME
 #define PACKAGE_NAME PACKAGE
 #endif

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