Fix bug 161: when --disable-threads is set, do not search for or link against pthreads libraries

svn:r4545

configure.in

@@ -61,8 +61,11 @@ AC_ARG_WITH(ssl-dir,
 
 AC_SEARCH_LIBS(socket, [socket])
 AC_SEARCH_LIBS(gethostbyname, [nsl])
-AC_SEARCH_LIBS(pthread_create, [pthread])
-AC_SEARCH_LIBS(pthread_detach, [pthread])
+
+if test $enable_threads = "yes"; then
+  AC_SEARCH_LIBS(pthread_create, [pthread])
+  AC_SEARCH_LIBS(pthread_detach, [pthread])
+fi
 
 dnl ------------------------------------------------------
 dnl Where do you live, libevent?  And how do we call you?
@@ -295,9 +298,15 @@ AC_CHECK_HEADERS(zlib.h, , AC_MSG_ERROR(Zlib header (zlib.h) not found. Tor requ
 
 dnl These headers are not essential
 
-AC_CHECK_HEADERS(stdint.h sys/types.h inttypes.h sys/param.h sys/wait.h sys/limits.h netinet/in.h arpa/inet.h machine/limits.h syslog.h sys/time.h sys/resource.h pthread.h stddef.h inttypes.h)
+AC_CHECK_HEADERS(stdint.h sys/types.h inttypes.h sys/param.h sys/wait.h sys/limits.h netinet/in.h arpa/inet.h machine/limits.h syslog.h sys/time.h sys/resource.h stddef.h inttypes.h)
+
+AC_CHECK_FUNCS(gettimeofday ftime socketpair uname inet_aton strptime getrlimit setrlimit strlcat strlcpy strtoull getpwnam ftello getaddrinfo localtime_r gmtime_r event_get_version event_get_method event_set_log_callback memmem)
+
+if test $enable_threads = "yes"; then
+  AC_CHECK_HEADERS(pthread.h)
+  AC_CHECK_FUNCS(pthread_create)
+fi
 
-AC_CHECK_FUNCS(gettimeofday ftime socketpair uname inet_aton strptime getrlimit setrlimit strlcat strlcpy strtoull getpwnam ftello pthread_create getaddrinfo localtime_r gmtime_r event_get_version event_get_method event_set_log_callback memmem)
 AC_FUNC_FSEEKO
 
 AC_CHECK_MEMBERS([struct timeval.tv_sec])