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What does this option to ld mean? -lrt I know to some degree it means that ld is looking for the library with real-time extensions, but after searching extensively, I couldn't find an exact definition (or which library) this is referring to. With Bionic (android) libc, the android NDK docs detail that this (along with pthreads) has been integrated. I ask because it seems to be implicit (ie when I invoke the compiler, a custom-compiled gdc, directly, I get a message saying that ld cannot find -lrt) EDIT From the Bionic Overview Bionic's C library comes with its own pthread implementation bundled in. This is different from other historical C libraries which: - place it in an external library (-lpthread) - play linker tricks with weak symbols at dynamic link time The support for real-time features (a.k.a. -lrt) is also bundled in the C library. The problem is that collect2 is passing the option -lrt (and also -lpthreads) to ld. dan@devbox:~/projects/gdc_test/jni/src$ $DC gdc_test.d -v -mthumb Using built-in specs. Target: arm-linux-androideabi Configured with: /arm/ndk-git/src/build/../gcc/gcc-4.4.3/configure --prefix=/arm/ndk-git/ndk/toolchains/arm-linux-androideabi-4.4.3/prebuilt/linux-x86 --target=arm-linux-androideabi --host=x86_64-linux-gnu --build=x86_64-linux-gnu --with-gnu-as --with-gnu-ld --enable-languages=c,c++ --with-gmp=/arm/ndk-git/build_run/temp-install --with-mpfr=/arm/ndk-git/build_run/temp-install --disable-libssp --enable-threads --disable-nls --disable-libmudflap --disable-libgomp --disable-libstdc__-v3 --disable-sjlj-exceptions --disable-shared --disable-tls --enable-languages=c,d,c++ --enable-lto --with-float=soft --with-fpu=vfp --with-arch=armv5te --enable-target-optspace --enable-shared--prefix=/arm/ndk-git/ndk/toolchains/arm-linux-androideabi-4.4.3/prebuilt/linux-x86 --enab

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