Ruby19 install fails on intel 10.4.11 with multiply defined symbols

[joda@…]

I tried sudo port -v install ruby19

Eventually I got this:
cc -dynamic -bundle -undefined suppress -flat_namespace -o ../../../../.ext/i386-darwin8/json/ext/parser.bundle parser.o unicode.o -L. -L../../../.. -L. -L/opt/local/lib -lruby1.9 -lpthread -ldl -lobjc
compiling mathn/complex
mkdir -p ../../../.ext/i386-darwin8/mathn
/usr/bin/gcc-4.0 -I. -I../../../.ext/include/i386-darwin8 -I../../.././include -I../../.././ext/mathn/complex -DRUBY_EXTCONF_H=\"extconf.h\" -DEXT_MATHN -DCANON -DCLCANON -fno-common -O2 -O2 -g -Wall -Wno-parentheses -fno-common -pipe -fno-common -o complex.o -c complex.c
cc -dynamic -bundle -undefined suppress -flat_namespace -o ../../../.ext/i386-darwin8/mathn/complex.bundle complex.o -L. -L../../.. -L. -L/opt/local/lib -lruby1.9 -lpthread -ldl -lobjc
/usr/bin/ld: multiple definitions of symbol _rb_complex_raw
complex.o definition of _rb_complex_raw in section (TEXT,text)
../../../libruby1.9.dylib(complex.o) definition of _rb_complex_raw
/usr/bin/ld: multiple definitions of symbol _rb_complex_polar
complex.o definition of _rb_complex_polar in section (TEXT,text)
../../../libruby1.9.dylib(complex.o) definition of _rb_complex_polar
/usr/bin/ld: multiple definitions of symbol _rb_complex_new
complex.o definition of _rb_complex_new in section (TEXT,text)
../../../libruby1.9.dylib(complex.o) definition of _rb_complex_new
/usr/bin/ld: multiple definitions of symbol _rb_Complex
complex.o definition of _rb_Complex in section (TEXT,text)
../../../libruby1.9.dylib(complex.o) definition of _rb_Complex
collect2: ld returned 1 exit status
make[1]: * .ext/i386-darwin8/mathn/complex.bundle Error 1
make: * [exts] Error 1

Warning: the following items did not execute (for ruby19): org.macports.activate org.macports.build org.macports.destroot org.macports.install
Error: Status 1 encountered during processing.

This is on a recently selfupdated macports on OS 10.4.11 on a MacBookPro