git clone https://github.com/mkj/dropbear.git
cd dropbear
cat > localoptions.h << EOF
#define DROPBEAR_SMALL_CODE 0
#define DROPBEAR_ENABLE_GCM_MODE 1
#define DROPBEAR_SHA1_HMAC 0
#define DROPBEAR_RSA 0
#define DROPBEAR_RSA_SHA1 0
#define DROPBEAR_ECDSA 0
#define DROPBEAR_SK_KEYS 0
#define DROPBEAR_DH_GROUP14_SHA1 0
#define DROPBEAR_DH_GROUP14_SHA256 0
#define DROPBEAR_ECDH 0
EOF
./configure --prefix=/u01/dropbear/ --enable-static --disable-zlib --disable-openpty
make -j2 PROGRAMS="dropbear dbclient dropbearkey dropbearconvert scp"
make PROGRAMS="dropbear dbclient dropbearkey dropbearconvert scp" install