me@pluto /cygdrive/G/bitcoin-build/bitcoin-0_15
$ make
Making all in src
make[1]: Entering directory '/cygdrive/G/bitcoin-build/bitcoin-0_15/src'
make[2]: Entering directory '/cygdrive/G/bitcoin-build/bitcoin-0_15/src'
make[3]: Entering directory '/cygdrive/G/bitcoin-build/bitcoin-0_15'
make[3]: Leaving directory '/cygdrive/G/bitcoin-build/bitcoin-0_15'
  CXX    crypto/libbitcoinconsensus_la-aes.lo
  CXX    crypto/libbitcoinconsensus_la-chacha20.lo
  CXX    crypto/libbitcoinconsensus_la-hmac_sha256.lo
  CXX    crypto/libbitcoinconsensus_la-hmac_sha512.lo
  CXX    crypto/libbitcoinconsensus_la-ripemd160.lo
  CXX    crypto/libbitcoinconsensus_la-sha1.lo
  CXX    crypto/libbitcoinconsensus_la-sha256.lo
  CXX    crypto/libbitcoinconsensus_la-sha512.lo
  CXX    libbitcoinconsensus_la-arith_uint256.lo
  CXX    consensus/libbitcoinconsensus_la-merkle.lo
  CXX    libbitcoinconsensus_la-hash.lo
  CXX    primitives/libbitcoinconsensus_la-block.lo
  CXX    primitives/libbitcoinconsensus_la-transaction.lo
  CXX    libbitcoinconsensus_la-pubkey.lo
  CXX    script/libbitcoinconsensus_la-bitcoinconsensus.lo
  CXX    script/libbitcoinconsensus_la-interpreter.lo
  CXX    script/libbitcoinconsensus_la-script.lo
  CXX    script/libbitcoinconsensus_la-script_error.lo
  CXX    libbitcoinconsensus_la-uint256.lo
  CXX    libbitcoinconsensus_la-utilstrencodings.lo
make[3]: Entering directory '/cygdrive/G/bitcoin-build/bitcoin-0_15/src/secp256k1'
gcc -I. -g -O2 -Wall -Wextra -Wno-unused-function -c src/gen_context.c -o gen_context.o
gcc gen_context.o -o gen_context
./gen_context
  CC     src/libsecp256k1_la-secp256k1.lo
  CCLD   libsecp256k1.la
libtool: warning: undefined symbols not allowed in i686-pc-cygwin shared libraries; building static only
make[3]: Leaving directory '/cygdrive/G/bitcoin-build/bitcoin-0_15/src/secp256k1'
  CXXLD  libbitcoinconsensus.la

*** Warning: This system cannot link to static lib archive secp256k1/libsecp256k1.la.
*** I have the capability to make that library automatically link in when
*** you link to this library.  But I can only do this if you have a
*** shared version of the library, which you do not appear to have.
.libs/libbitcoinconsensus_la-pubkey.o: In function `ecdsa_signature_parse_der_lax':
/cygdrive/G/bitcoin-build/bitcoin-0_15/src/pubkey.cpp:34: undefined reference to `secp256k1_ecdsa_signature_parse_compact'
/cygdrive/G/bitcoin-build/bitcoin-0_15/src/pubkey.cpp:156: undefined reference to `secp256k1_ecdsa_signature_parse_compact'
/cygdrive/G/bitcoin-build/bitcoin-0_15/src/pubkey.cpp:162: undefined reference to `secp256k1_ecdsa_signature_parse_compact'
.libs/libbitcoinconsensus_la-pubkey.o: In function `ZNK7CPubKey6VerifyERK7uint256RKSt6vectorIhSaIhEE':
/cygdrive/G/bitcoin-build/bitcoin-0_15/src/pubkey.cpp:172: undefined reference to `secp256k1_ec_pubkey_parse'
/cygdrive/G/bitcoin-build/bitcoin-0_15/src/pubkey.cpp:180: undefined reference to `secp256k1_ecdsa_signature_normalize'
/cygdrive/G/bitcoin-build/bitcoin-0_15/src/pubkey.cpp:181: undefined reference to `secp256k1_ecdsa_verify'
.libs/libbitcoinconsensus_la-pubkey.o: In function `ZN7CPubKey14RecoverCompactERK7uint256RKSt6vectorIhSaIhEE':
/cygdrive/G/bitcoin-build/bitcoin-0_15/src/pubkey.cpp:191: undefined reference to `secp256k1_ecdsa_recoverable_signature_pars
e_compact'
/cygdrive/G/bitcoin-build/bitcoin-0_15/src/pubkey.cpp:194: undefined reference to `secp256k1_ecdsa_recover'
/cygdrive/G/bitcoin-build/bitcoin-0_15/src/pubkey.cpp:199: undefined reference to `secp256k1_ec_pubkey_serialize'
.libs/libbitcoinconsensus_la-pubkey.o: In function `ZNK7CPubKey12IsFullyValidEv':
/cygdrive/G/bitcoin-build/bitcoin-0_15/src/pubkey.cpp:208: undefined reference to `secp256k1_ec_pubkey_parse'
.libs/libbitcoinconsensus_la-pubkey.o: In function `ZN7CPubKey10DecompressEv':
/cygdrive/G/bitcoin-build/bitcoin-0_15/src/pubkey.cpp:215: undefined reference to `secp256k1_ec_pubkey_parse'
/cygdrive/G/bitcoin-build/bitcoin-0_15/src/pubkey.cpp:220: undefined reference to `secp256k1_ec_pubkey_serialize'
.libs/libbitcoinconsensus_la-pubkey.o: In function `ZNK7CPubKey6DeriveERS_R7uint256jRKS1_':
/cygdrive/G/bitcoin-build/bitcoin-0_15/src/pubkey.cpp:233: undefined reference to `secp256k1_ec_pubkey_parse'
/cygdrive/G/bitcoin-build/bitcoin-0_15/src/pubkey.cpp:236: undefined reference to `secp256k1_ec_pubkey_tweak_add'
/cygdrive/G/bitcoin-build/bitcoin-0_15/src/pubkey.cpp:241: undefined reference to `secp256k1_ec_pubkey_serialize'
.libs/libbitcoinconsensus_la-pubkey.o: In function `ZN7CPubKey9CheckLowSERKSt6vectorIhSaIhEE':
/cygdrive/G/bitcoin-build/bitcoin-0_15/src/pubkey.cpp:277: undefined reference to `secp256k1_ecdsa_signature_normalize'
.libs/libbitcoinconsensus_la-pubkey.o: In function `ZN15ECCVerifyHandleC2Ev':
/cygdrive/G/bitcoin-build/bitcoin-0_15/src/pubkey.cpp:286: undefined reference to `secp256k1_context_create'
.libs/libbitcoinconsensus_la-pubkey.o: In function `ZN15ECCVerifyHandleD2Ev':
/cygdrive/G/bitcoin-build/bitcoin-0_15/src/pubkey.cpp:297: undefined reference to `secp256k1_context_destroy'
collect2: error: ld returned 1 exit status
make[2]: *** [Makefile:3241: libbitcoinconsensus.la] Error 1
make[2]: Leaving directory '/cygdrive/G/bitcoin-build/bitcoin-0_15/src'
make[1]: *** [Makefile:9210: all-recursive] Error 1
make[1]: Leaving directory '/cygdrive/G/bitcoin-build/bitcoin-0_15/src'
make: *** [Makefile:670: all-recursive] Error 1

me@pluto /cygdrive/G/bitcoin-build/bitcoin-0_15
$