I haven't tried compiling on OSX in a while. It appears that the multicore support introduced a new error:
libtool: compile: g++ -DHAVE_CONFIG_H -I. -I../.. -rdynamic -g -O2 -MT template_OP2.lo -MD -MP -MF .deps/template_OP2.Tpo -c template_OP2.cc -fno-common -DPIC -o .libs/template_OP2.o
clang: warning: argument unused during compilation: '-rdynamic'
clang: warning: argument unused during compilation: '-rdynamic'
clang: warning: argument unused during compilation: '-rdynamic'
clang: warning: argument unused during compilation: '-rdynamic'
libtool: compile: g++ -DHAVE_CONFIG_H -I. -I../.. -rdynamic -g -O2 -MT template_OP1.lo -MD -MP -MF .deps/template_OP1.Tpo -c template_OP1.cc -fno-common -DPIC -o .libs/template_OP1.o
clang: warning: argument unused during compilation: '-rdynamic'
In file included from template_F12.cc:22:
In file included from ./template.hh:25:
In file included from ./../Value.icc:24:
In file included from ./../Value.hh:36:
./../Parallel.hh:50:10: fatal error: 'ext/atomicity.h' file not found
#include <ext/atomicity.h>
^