Add detection and optional support for UMFPACK and OPMPressure.

configure.ac

@@ -4,7 +4,7 @@ AC_PREREQ([2.50])
 
 AC_INIT([opmtransport], [0.1], [Jostein.R.Natvig@sintef.no])
 
-AM_INIT_AUTOMAKE([foreign -Wall])
+AM_INIT_AUTOMAKE([-Wall -Werror foreign])
 
 # Use "silent" rules by default if available in the Automake being used to
 # process this setup.  See, e.g.,
@@ -23,19 +23,45 @@ AC_CONFIG_HEADERS([config.h])
 
 # Checks for programs.
 AC_PROG_CC
-AC_PROG_LIBTOOL
+AC_PROG_CXX
+
+AC_PROG_F77
+AC_F77_WRAPPERS
 
 # Checks for libraries.
+AC_CHECK_LIB([m], [sqrt])
+AX_LAPACK
 
 # Checks for header files.
-AC_CHECK_HEADERS([assert.h stdlib.h])
+AC_CHECK_HEADERS([assert.h limits.h stdlib.h])
+
+AC_CHECK_HEADERS([sparse_sys.h],
+                 [sparse_sys_header=yes],
+                 [sparse_sys_header=no])
+
+AC_CHECK_HEADERS([suitesparse/umfpack.h],
+                 [umfpack_header=yes],
+                 [umfpack_header=no])
 
 # Checks for typedefs, structures, and compiler characteristics.
+AC_TYPE_SIZE_T
 
 # Checks for library functions.
 AC_FUNC_MALLOC
 AC_FUNC_REALLOC
-AC_CHECK_FUNCS([floor memmove memset])
+AC_CHECK_FUNCS([floor memmove memset pow sqrt])
+
+AC_SEARCH_LIBS([umfpack_dl_solve], [umfpack],
+               [umfpack_lib=yes], [umfpack_lib=no])
+
+AC_SEARCH_LIBS([csrmatrix_elm_index], [opmpressure],
+               [sparse_sys_lib=yes],
+               [sparse_sys_lib=no], [$LAPACK_LIBS $BLAS_LIBS])
+
+AM_CONDITIONAL([UMFPACK],
+  [test "x$umfpack_header" != "xno" -a "x$umfpack_lib" != "xno"])
+AM_CONDITIONAL([OPMPRESSURE_SPARSE_SYS],
+  [test "x$sparse_sys_header" != "xno" -a "x$sparse_sys_lib" != "xno"])
 
 AC_CONFIG_FILES([
   Makefile