configure.ac: Explicitly check for -lcsv and csv.h

unfortuantely libcsv doesn't ship with a pkg-config file, so we have
to resort on those manual checks

Change-Id: I52260a4e3f7a12039f054a55a211045085f1c5ff
diff --git a/configure.ac b/configure.ac
index ed3540c..2c30dfb 100644
--- a/configure.ac
+++ b/configure.ac
@@ -32,6 +32,9 @@
 fi
 PKG_PROG_PKG_CONFIG([0.20])
 
+AC_CHECK_LIB(csv, csv_init, LIBS="$LIBS -lcsv", [AC_MSG_ERROR([*** libcsv library not found!])])
+AC_CHECK_HEADERS([csv.h])
+
 PKG_CHECK_MODULES(OSMOCORE, libosmocore >= 0.11.0)
 PKG_CHECK_MODULES(OSMOGSM, libosmogsm >= 0.11.0)
 PKG_CHECK_MODULES(OSMOABIS, libosmoabis)