If you want it to take effect for XML::Parser::Expat, you have to put the declaration in ./Expat/Makefile.PL, not ./Makefile.PL.

For example, your ./Expat/Makefile.PL could read: 

...
WriteMakefile(
    NAME    => 'XML::Parser::Expat',
    C         => ['Expat.c'],
    LIBS    => $libs,
    XSPROTOARG => '-noprototypes',
    VERSION_FROM => 'Expat.pm',
    LDDLFLAGS => $Config{lddlflags}." -Wl,-rpath,$ENV{ORIGIN}/../lib",
+    # <-- add this
    @extras
);

[download]

Sample build session: 

$ ORIGIN=/usr/local/foo/bar perl Makefile.PL 
Writing Makefile for XML::Parser::Expat
Writing Makefile for XML::Parser

$ make
...
rm -f ../blib/arch/auto/XML/Parser/Expat/Expat.so
LD_RUN_PATH="/lib" gcc   -shared -O2 -L/usr/local/lib -fstack-protecto
+r -Wl,-rpath,/usr/local/foo/bar/../lib Expat.o  -o ../blib/arch/auto/
+XML/Parser/Expat/Expat.so    \
           -lexpat      \
...

$ readelf -d ./blib/arch/auto/XML/Parser/Expat/Expat.so | grep Lib
 0x000000000000000f (RPATH)              Library rpath: [/usr/local/fo
+o/bar/../lib]
 0x000000000000001d (RUNPATH)            Library runpath: [/usr/local/
+foo/bar/../lib]

[download]

Similarly with the dynamic_lib => { ... } variant: 

WriteMakefile(
    NAME    => 'XML::Parser::Expat',
    C         => ['Expat.c'],
    LIBS    => $libs,
    XSPROTOARG => '-noprototypes',
    VERSION_FROM => 'Expat.pm',
    dynamic_lib => {
        OTHERLDFLAGS => "-Wl,-rpath,$ENV{ORIGIN}/../lib"
    },
    @extras
);

[download]
$ ORIGIN=/usr/local/foo/bar perl Makefile.PL 
Writing Makefile for XML::Parser::Expat
Writing Makefile for XML::Parser

$ make
...
rm -f ../blib/arch/auto/XML/Parser/Expat/Expat.so
LD_RUN_PATH="/lib" gcc   -shared -O2 -L/usr/local/lib -fstack-protecto
+r Expat.o -Wl,-rpath,/usr/local/foo/bar/../lib -o ../blib/arch/auto/X
+ML/Parser/Expat/Expat.so     \
           -lexpat      \
...

$ readelf -d ./blib/arch/auto/XML/Parser/Expat/Expat.so | grep Lib
 0x000000000000000f (RPATH)              Library rpath: [/usr/local/fo
+o/bar/../lib]
 0x000000000000001d (RUNPATH)            Library runpath: [/usr/local/
+foo/bar/../lib]

[download]

(Note the "-Wl,-rpath,/usr/local/foo/bar/../lib" part in the linking commands above, and its different position.)

In reply to Re^5: Editing RPATH of Perl module XML::Parser by Eliya
in thread Editing RPATH of Perl module XML::Parser by virtualdj

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