Check unit test framework can be disabled

using --disable-check configure option

Makefile.am

@@ -7,6 +7,10 @@ docs:
 .PHONY: docs
 endif
 
-SUBDIRS += src . tests
+SUBDIRS += src .
+
+if CHECK
+SUBDIRS += tests
+endif
 CLEANFILES = 
 

configure.ac

@@ -21,6 +21,15 @@ AC_ARG_ENABLE([debug],[  --enable-debug turn on debugging],
 esac],[debug=false])
 AM_CONDITIONAL([DEBUG], [test x$debug = xtrue])
 
+AC_ARG_ENABLE([check],[  --disable-check disable unit test support],
+[case "${enableval}" in
+	yes) check=true ;;
+	no)  check=false ;;
+	*) AC_MSG_ERROR([bad value ${enableval} for --enable-check]) ;;
+esac],[check=true])
+AM_CONDITIONAL([CHECK], [test x$check = xtrue])
+
+
 AC_CONFIG_HEADERS([src/include/config.h])
 AC_CONFIG_SRCDIR([src/main.c])
 AC_CONFIG_MACRO_DIR([m4])
@@ -51,11 +60,14 @@ else
 fi
 
 # Checks for libraries.
-AC_SEARCH_LIBS([dlopen], [dl dld], [], [
-	AC_MSG_ERROR([unable to find the dlopen() function])
-])
-PKG_CHECK_MODULES([CHECK], [check >= 0.9.4]) 
-AS_IF([test x$debug = xtrue], [CK_FORK=no],[])
+if test x$check = xtrue
+then
+	PKG_CHECK_MODULES([CHECK], [check >= 0.9.4], [],
+	AC_MSG_FAILURE([Unable to locate (check unit test c framework).
+You can run ./configure --disable-check if you do not need unit tests.
+])) 
+	AS_IF([test x$debug = xtrue], [CK_FORK=no],[])
+fi
 
 # Checks for header files.
 AC_CHECK_HEADERS([stdlib.h string.h])