Add librevisa SCPI backend.
diff --git a/configure.ac b/configure.ac
index df6c039..0ac2ec2 100644
--- a/configure.ac
+++ b/configure.ac
@@ -316,6 +316,22 @@
# Serial port helper code is only compiled in if libserialport was found.
AM_CONDITIONAL(NEED_SERIAL, test "x$have_libserialport" != xno)
+PKG_CHECK_MODULES([librevisa], [librevisa >= 0.0.20130812],
+ [CFLAGS="$CFLAGS $librevisa_CFLAGS";
+ LIBS="$LIBS $librevisa_LIBS";
+ SR_PKGLIBS="$SR_PKGLIBS librevisa"], [])
+
+# VISA SCPI backend is only compiled in if librevisa was found.
+AM_CONDITIONAL(NEED_VISA, test "x$have_librevisa" != xno)
+
+# Define HAVE_LIBREVISA in config.h if we found librevisa.
+if test "x$have_librevisa" != "xno"; then
+ AC_DEFINE_UNQUOTED(HAVE_LIBREVISA, [1],
+ [Specifies whether we have librevisa.])
+fi
+
+AM_CONDITIONAL(NEED_VISA, test "x$have_librevisa" != xno)
+
# libusb-1.0 is only needed for some hardware drivers. Disable the respective
# drivers if it is not found.
case "$host" in
@@ -635,7 +651,7 @@
echo
# Note: This only works for libs with pkg-config integration.
-for lib in "glib-2.0 >= 2.32.0" "libzip >= 0.10" "libserialport >= 0.1.0" "libusb-1.0 >= 1.0.16" "libftdi >= 0.16" "libudev >= 151" "alsa >= 1.0" "check >= 0.9.4"; do
+for lib in "glib-2.0 >= 2.32.0" "libzip >= 0.10" "libserialport >= 0.1.0" "librevisa >= 0.0.20130812" "libusb-1.0 >= 1.0.16" "libftdi >= 0.16" "libudev >= 151" "alsa >= 1.0" "check >= 0.9.4"; do
if `$PKG_CONFIG --exists $lib`; then
ver=`$PKG_CONFIG --modversion $lib`
answer="yes ($ver)"