dbus build failure: how to resolve?

[Paul Beard]

libtool: link: cc -fno-strict-aliasing -fno-common -Wall -Wextra -Wundef -Wnested-externs -Wwrite-strings -Wpointer-arith -Wmissing-declarations -Wmissing-prototypes -Wstrict-prototypes -Wredundant-decls -Wno-unused-parameter -Wno-missing-field-initializers -Wdeclaration-after-statement -Wformat=2 -Wold-style-definition -Wcast-align -Wformat-nonliteral -Wformat-security -Wsign-compare -Wstrict-aliasing -Wshadow -Winline -Wpacked -Wmissing-format-attribute -Wmissing-noreturn -Winit-self -Wmissing-include-dirs -Warray-bounds -Wimplicit-function-declaration -Wreturn-type -Wswitch-enum -Wswitch-default -Wchar-subscripts -Wfloat-equal -Wpointer-sign -Wno-deprecated-declarations -Wno-unused-label -Wno-error=unused-parameter -Wno-error=missing-field-initializers -Wno-error=deprecated-declarations -Wno-error=unused-label -O2 -pipe -fstack-protector-strong -isystem /usr/local/include -fno-strict-aliasing -Wl,--no-as-needed -fstack-protector-strong -o .libs/dbus-launch dbus_launch-dbus-launch.o dbus_launch-dbus-launch-x11.o dbus_launch-tool-common.o  ../dbus/.libs/libdbus-1.so -L/usr/local/lib -lSM -lICE -lX11 -lexecinfo -Wl,-rpath -Wl,/usr/local/lib
../dbus/.libs/libdbus-1.so: undefined reference to `_sem_timedwait'
../dbus/.libs/libdbus-1.so: undefined reference to `_sem_getvalue'
../dbus/.libs/libdbus-1.so: undefined reference to `_sem_destroy'
../dbus/.libs/libdbus-1.so: undefined reference to `_sem_wait'
../dbus/.libs/libdbus-1.so: undefined reference to `_sem_init'
../dbus/.libs/libdbus-1.so: undefined reference to `_sem_post'
../dbus/.libs/libdbus-1.so: undefined reference to `_sem_trywait'