Auto-detect whether -lrt is needed.

git-svn-id: https://urjtag.svn.sourceforge.net/svnroot/urjtag/trunk@826 b68d4a1b-bc3d-0410-92ed-d4ac073336b7

jtag/configure.ac

@@ -160,6 +160,8 @@ fi
 AC_CHECK_FUNCS(getline getdelim)
 AC_CHECK_FUNCS(swprintf)
 
+AC_CHECK_FUNC(clock_gettime, [], [ AC_CHECK_LIB(rt, clock_gettime) ])
+
 AC_CHECK_HEADERS(linux/ppdev.h)
 
 VL_LIB_READLINE

jtag/src/Makefile.am

@@ -68,10 +68,5 @@ jtag_LDADD = \
 	-lm \
 	@LIBINTL@
 
-# Removed -lrt (added in 704 for busy loop waiting; not
-# available in Cygwin. not needed? If you re-add -lrt here
-# please consider to add checks in configure.ac whether
-# it is avaiable and really needed
-
 localedir = $(datadir)/locale
 INCLUDES = -DLOCALEDIR=\"$(localedir)\"