crypto/kdf/build.info - third_party/openssl - Git at Google

 LIBS=../../libcrypto
 SOURCE[../../libcrypto]=\
         tls1_prf.c kdf_err.c hkdf.c scrypt.c
	LIBS=../../libcrypto
	SOURCE[../../libcrypto]=\
	tls1_prf.c kdf_err.c hkdf.c scrypt.c