diff -urN gdl-0.9.8_old/CMakeLists.txt gdl-0.9.8/CMakeLists.txt
--- gdl-0.9.8_old/CMakeLists.txt	2018-08-05 20:47:42.332868644 +0200
+++ gdl-0.9.8/CMakeLists.txt	2018-08-05 20:52:35.440704154 +0200
@@ -356,28 +356,42 @@
         "(suitable Fedora package: gsl-devel)")
 endif(GSL_FOUND)
 
-if(WIN32 AND NOT CYGWIN)
-set(CMAKE_PREFIX_PATH ${XDRDIR})
-find_package(Xdr)
-set(HAVE_LIBXDR ${XDR_FOUND})
-if(XDR_FOUND)
-	set(LIBRARIES ${LIBRARIES} ${XDR_LIBRARIES})
-	include_directories(${XDR_INCLUDE_DIR})
-else(XDR_FOUND)
-	message(FATAL_ERROR "bsd-xdr library is required but was not found.\n"
-	"Use -DXDRDIR=DIR to specify the bsd-xdr directory tree.")
-endif(XDR_FOUND)
+if(UNIX)
+	set(CMAKE_PREFIX_PATH ${RPCDIR})
+	find_package(RPC QUIET)
+	set(HAVE_RPC ${RPC_FOUND})
+	if(RPC_FOUND)
+		set(LIBRARIES ${LIBRARIES} ${RPC_LIBRARIES})
+		include_directories(${RPC_INCLUDE_DIR})
+	else(RPC_FOUND)
+		message(FATAL_ERROR "RPC support is mandatory.\n"
+		"Note that SunRPC has been removed in glibc-2.26 and later, "
+		"while being optional in earlier versions. Consider using the "
+		"recommended and more modern libtirpc instead.\n"
+		"Use -DRPCDIR=DIR to specify the rpc directory tree.\n")
+	endif(RPC_FOUND)
+elseif(WIN32 AND NOT CYGWIN)
+	set(CMAKE_PREFIX_PATH ${XDRDIR})
+	find_package(Xdr)
+	set(HAVE_LIBXDR ${XDR_FOUND})
+	if(XDR_FOUND)
+		set(LIBRARIES ${LIBRARIES} ${XDR_LIBRARIES})
+		include_directories(${XDR_INCLUDE_DIR})
+	else(XDR_FOUND)
+		message(FATAL_ERROR "bsd-xdr library is required but was not found.\n"
+			"Use -DXDRDIR=DIR to specify the bsd-xdr directory tree.")
+	endif(XDR_FOUND)
 
-set(CMAKE_PREFIX_PATH ${PCREDIR})
-find_package(PCRE)
-set(HAVE_LIBPCRE ${PCRE_FOUND})
-if(PCRE_FOUND)
-	set(LIBRARIES ${LIBRARIES} ${PCRE_LIBRARIES})
-	include_directories(${PCRE_INCLUDE_DIR})
-else(PCRE_FOUND)
-	message(FATAL_ERROR "pcre library is required but was not found.\n"
-	"Use -DPCREDIR=DIR to specify the pcre directory tree.")
-endif(PCRE_FOUND)
+	set(CMAKE_PREFIX_PATH ${PCREDIR})
+	find_package(PCRE)
+	set(HAVE_LIBPCRE ${PCRE_FOUND})
+	if(PCRE_FOUND)
+		set(LIBRARIES ${LIBRARIES} ${PCRE_LIBRARIES})
+		include_directories(${PCRE_INCLUDE_DIR})
+	else(PCRE_FOUND)
+		message(FATAL_ERROR "pcre library is required but was not found.\n"
+			"Use -DPCREDIR=DIR to specify the pcre directory tree.")
+	endif(PCRE_FOUND)
 	LINK_LIBRARIES(shlwapi gnurx)
 endif(WIN32 AND NOT CYGWIN)
 
diff -urN gdl-0.9.8_old/CMakeModules/FindRPC.cmake gdl-0.9.8/CMakeModules/FindRPC.cmake
--- gdl-0.9.8_old/CMakeModules/FindRPC.cmake	1970-01-01 01:00:00.000000000 +0100
+++ gdl-0.9.8/CMakeModules/FindRPC.cmake	2018-08-05 20:54:31.086701032 +0200
@@ -0,0 +1,12 @@
+
+include(FindPackageHandleStandardArgs)
+find_path(RPC_INCLUDE_DIR NAMES "rpc/rpc.h" PATH_SUFFIXES "tirpc")
+ if(RPC_INCLUDE_DIR MATCHES "/tirpc/?$")
+	find_library(RPC_LIBRARY NAMES tirpc)
+	set(RPC_LIBRARIES ${RPC_LIBRARY})
+	find_package_handle_standard_args(RPC DEFAULT_MSG RPC_INCLUDE_DIR RPC_LIBRARY RPC_LIBRARIES)
+else()
+	find_package_handle_standard_args(RPC DEFAULT_MSG RPC_INCLUDE_DIR)
+endif()
+ mark_as_advanced(RPC_INCLUDE_DIR RPC_LIBRARY RPC_LIBRARIES)
+