0.4.39 fails to compile: error: redefinition of typedef ‘OrcX86Target’

FAILED: orc/liborc-0.4.0.dylib.p/orcprogram-x86.c.o 
ccache /usr/bin/gcc-4.2 -Iorc/liborc-0.4.0.dylib.p -Iorc -I../orc-0.4.39/orc -I. -I../orc-0.4.39 -I/opt/local/include -Wall -Winvalid-pch -O2 -g -DHAVE_CONFIG_H -we4013 -Wno-implicit-int -Wno-implicit-function-declaration -fvisibility=hidden -pipe -Os -std=gnu99 -arch ppc -DORC_ENABLE_UNSTABLE_API -D_GNU_SOURCE -DBUILDING_ORC -MD -MQ orc/liborc-0.4.0.dylib.p/orcprogram-x86.c.o -MF orc/liborc-0.4.0.dylib.p/orcprogram-x86.c.o.d -o orc/liborc-0.4.0.dylib.p/orcprogram-x86.c.o -c ../orc-0.4.39/orc/orcprogram-x86.c
In file included from ../orc-0.4.39/orc/orcprogram-x86.c:10:
../orc-0.4.39/orc/orcx86-private.h:5: error: redefinition of typedef ‘OrcX86Target’
../orc-0.4.39/orc/orcx86.h:49: error: previous declaration of ‘OrcX86Target’ was here
../orc-0.4.39/orc/orcx86-private.h:6: error: redefinition of typedef ‘OrcTarget’
../orc-0.4.39/orc/orcutils.h:40: error: previous declaration of ‘OrcTarget’ was here