Explicitly link to -lrt if required.

configure.ac

@@ -342,6 +342,12 @@ AM_CONDITIONAL([USE_PPM_CORE],[test $enable_ppm = yes])
 AM_CONDITIONAL([HAVE_PARALLEL_NC4],[test $HAVE_PARALLEL_NC4 -gt 0])
 AC_SUBST([USE_MPI])
 AC_SUBST([ENABLE_MPI],[`test x"$enable_mpi" = xyes && echo true || echo false`])
+AC_SUBST([LIBRT])
+AM_COND_IF([USE_MPI],
+  [LIBS_save=$LIBS
+   AC_SEARCH_LIBS([aio_suspend], [rt],
+     [test "x$ac_res" = "xnone required" || LIBRT=$ac_res])
+   LIBS=$LIBS_save])
 #  ----------------------------------------------------------------------
 #  Create the Fortran Interface via iso_c_binding module (Fortran 2003 Standard)
 #

src/Makefile.am

@@ -245,7 +245,7 @@ libcdipio_la_SOURCES += $(libcdipio_la_HAVE_PARALLEL_NC4_extra_sources)
 endif
 endif
 
-libcdipio_la_LIBADD    = libcdi.la $(PPM_CORE_LIBS) $(YAXT_LIBS) $(MPI_C_LIB)
+libcdipio_la_LIBADD    = libcdi.la $(PPM_CORE_LIBS) $(YAXT_LIBS) $(MPI_C_LIB) $(LIBRT)
 
 libcdi_la_LIBADD    = $(UUID_C_LIB)
 #

src/pkgconfig/cdipio.pc.in

@@ -4,7 +4,7 @@ libdir=@libdir@
 includedir=@includedir@
 cflags=-I@includedir@
 fcflags=@FPP_INCOPT@@includedir@ @CDI_F90_INTERFACE_FCFLAGS@
-libs=-L@libdir@ -lcdipio @PPM_CORE_LIBS@ @YAXT_LIBS@ -lcdi @GRIB_API_LIBS@ @NETCDF_LIBS@ @SZLIB_LIBS@ @THREADS_LIBS@ @LIBS@
+libs=-L@libdir@ -lcdipio @PPM_CORE_LIBS@ @YAXT_LIBS@ @MPI_C_LIB@ @LIBRT@ -lcdi @GRIB_API_LIBS@ @NETCDF_LIBS@ @SZLIB_LIBS@ @THREADS_LIBS@ @LIBS@
 threads_libs=@THREADS_LIBS@
 threads_cflags=@THREADS_INCLUDE@
 szlib_cflags=@SZLIB_INCLUDE@