Hello,

On Tue, Mar 14, 2023 at 06:16:14PM +0100, Ramon Carbonell wrote:
compiling with the xdr
I am getting messages like 
src/su/lib/fgettr.c:148: undefined reference to `xdr_float'
src/su/lib/fputtr.c:123: undefined reference to `xdr_vector'
I am running Ubuntu 22.04 and somehow, although xdr.h is installed at rpc/xdr.h
I am not sure why the compiler does not locate it.

That's because it's a linking error, the compiler found your include
but the linker doesn't know it needs to use an additional library.

This change makes it buildable on current Ubuntu LTS:

diff --git a/src/Makefile.config b/src/Makefile.config
index a1b8699c11e2..f7cdd4feab08 100644
--- a/src/Makefile.config
+++ b/src/Makefile.config
@@ -68,7 +68,7 @@ RANFLAGS =
 ICHMODLINE = chmod 644 $@
 MCHMODLINE = chmod 755 $@

-POSTLFLAGS = 
+POSTLFLAGS = $(shell pkg-config --libs libtirpc)
 
 #-----------------------------------------------------------------------
 # use both X11 path conventions
@@ -92,8 +92,8 @@ CPP = /usr/bin/cpp
 CC = /usr/bin/gcc
 #OPTC = -g -c90  -m64 -Wall -ansi  -Wno-long-long
 #OPTC = -g -std=c90  -m64 -Wall -ansi  -Wno-long-long
-OPTC = -g -std=c99  -m64 -Wall -ansi  -Wno-long-long 
-CFLAGS = -I$I $(OPTC) $(CWP_FLAGS)
+OPTC = -g -std=c99  -m64 -Wall -ansi  -Wno-long-long -D_ISOC99_SOURCE
+CFLAGS = -I$I $(OPTC) $(CWP_FLAGS) $(shell pkg-config --cflags libtirpc)
 
 # if gfortran is made using Homebrew
 FC = gfortran

-- 
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