libsecp256k1 build error

src/bench_ecdh.c:39:13: error: ‘bench_ecdh’ redeclared as different kind of symbol
 static void bench_ecdh(void* arg) {
             ^~~~~~~~~~
src/bench_ecdh.c:18:3: note: previous declaration of ‘bench_ecdh’ was here
 } bench_ecdh;
   ^~~~~~~~~~
src/bench_ecdh.c: In function ‘bench_ecdh’:
src/bench_ecdh.c:42:17: error: ‘data’ undeclared (first use in this function); did you mean ‘atan’?
     bench_ecdh *data = (bench_ecdh*)arg;
                 ^~~~
                 atan
src/bench_ecdh.c:42:17: note: each undeclared identifier is reported only once for each function it appears in
src/bench_ecdh.c:42:36: error: expected expression before ‘)’ token
     bench_ecdh *data = (bench_ecdh*)arg;
                                    ^
src/bench_ecdh.c:39:30: warning: unused parameter ‘arg’ [-Wunused-parameter]
 static void bench_ecdh(void* arg) {
                              ^~~
src/bench_ecdh.c: In function ‘main’:
src/bench_ecdh.c:50:5: warning: statement with no effect [-Wunused-value]
     bench_ecdh data;
     ^~~~~~~~~~
src/bench_ecdh.c:50:16: error: expected ‘;’ before ‘data’
     bench_ecdh data;
                ^~~~
src/bench_ecdh.c:52:64: error: ‘data’ undeclared (first use in this function); did you mean ‘atan’?
     run_benchmark("ecdh", bench_ecdh, bench_ecdh_setup, NULL, &data, 10, 20000);
                                                                ^~~~
                                                                atan
make: *** [Makefile:1008: src/bench_ecdh.o] Error 1