gcc -Iinclude -Wall -std=c99 -O3 -fPIC -c -o src/core/engine.o src/core/engine.c
src/core/engine.c: In function ‘yukonEngineCreate’:
src/core/engine.c:8: error: invalid application of ‘sizeof’ to incomplete type ‘struct yukonEngine’ 
src/core/engine.c:12: error: dereferencing pointer to incomplete type
src/core/engine.c:12: warning: implicit declaration of function ‘yukonStreamCreate’
src/core/engine.c:13: error: dereferencing pointer to incomplete type
src/core/engine.c:19: error: dereferencing pointer to incomplete type
src/core/engine.c:20: error: dereferencing pointer to incomplete type
src/core/engine.c:22: error: dereferencing pointer to incomplete type
src/core/engine.c:22: error: dereferencing pointer to incomplete type
src/core/engine.c:24: error: dereferencing pointer to incomplete type
src/core/engine.c:25: error: dereferencing pointer to incomplete type
src/core/engine.c:26: error: dereferencing pointer to incomplete type
src/core/engine.c:26: error: ‘audioThreadCallback’ undeclared (first use in this function)
src/core/engine.c:26: error: (Each undeclared identifier is reported only once
src/core/engine.c:26: error: for each function it appears in.)
src/core/engine.c:28: error: dereferencing pointer to incomplete type
src/core/engine.c:28: error: dereferencing pointer to incomplete type
src/core/engine.c:31: warning: implicit declaration of function ‘yukonStreamPut’
src/core/engine.c:31: error: dereferencing pointer to incomplete type
src/core/engine.c: In function ‘yukonEngineCapture’:
src/core/engine.c:54: warning: implicit declaration of function ‘yukonStreamStatus’
src/core/engine.c:54: error: dereferencing pointer to incomplete type
src/core/engine.c:59: error: dereferencing pointer to incomplete type
src/core/engine.c:64: error: dereferencing pointer to incomplete type
src/core/engine.c:64: error: dereferencing pointer to incomplete type
src/core/engine.c:68: error: dereferencing pointer to incomplete type
src/core/engine.c:68: error: dereferencing pointer to incomplete type
src/core/engine.c:69: error: dereferencing pointer to incomplete type
src/core/engine.c: In function ‘yukonEngineDestroy’:
src/core/engine.c:74: error: dereferencing pointer to incomplete type
src/core/engine.c:75: error: dereferencing pointer to incomplete type
src/core/engine.c:76: error: dereferencing pointer to incomplete type
src/core/engine.c:78: error: dereferencing pointer to incomplete type
src/core/engine.c:80: warning: implicit declaration of function ‘yukonStreamDestroy’
src/core/engine.c:80: error: dereferencing pointer to incomplete type
make: *** [src/core/engine.o] Error 1