Hi This is a long shot. Just upgraded LMDB to 0.9.16 for lmdbjni (Java bindings for LMDB) and when building for android-ndk-r10e I get a build error complaing about undeclared PTHREAD_MUTEX_ROBUST [1]. The build procedure uses automake and is quite complex because of Java JNI bindings but maybe the build error/output rings a bell anyway? The build works fine with LMDB 0.9.15. Cheers, -Kristoffer [1] src/mdb.c:4636:49: error: 'PTHREAD_MUTEX_ROBUST' undeclared (first use in this function) [2] Full build output - http://pastebin.com/JwreP0dZ [3] agcc #!/bin/bash $NDK/toolchains/arm-linux-androideabi-4.9/prebuilt/linux-x86_64/bin/arm-linux-androideabi-gcc --sysroot=$NDK/platforms/android-19/arch-arm -DMDB_DSYNC=O_SYNC $@