For QLMesh (and some other projects), I am running my own fork of Asset Import Library. The difference: it is amalgamated build - all sources are merged into one file (including dependencies). Since Assimp recently switched to miniz, I have replaced remaining references to zlib with miniz - so zlib is not required too.
drwxr-xr-x 85 piecuchp staff 2890 Jan 17 23:34 assimp -rw-r--r-- 1 piecuchp staff 4921627 Jan 17 23:34 assimp.cpp -rw-r--r-- 1 piecuchp staff 2893785 Jan 17 23:34 private\assimp.h
Everything you need to buid the assimp is:
g++ -c -std=c++11 code-portable/assimp.cpp
or just add assimp.cpp to your project/IDE (you can find code-portable directory in my repo.
One disclaimer: I have only tested this amalgamation under OSX with QLMesh). Main reason for this amalgamation is that it makes compilation/recompilation on different platforms with different configurations rather easier.
Side-effect is that single-file assimp.cpp compiles really fast (like 10x faster on my MacBook than original project files).