does not seem to be able to install on python3

Seems a number of places in the code break on the "new" python 3.9 version when attempting to install.
(venv) alexwestfall@GLMJ61G4HL4QL pypredict % sudo python3 setup.py install
Password:
running install
running build
running build_py
creating build
creating build/lib.macosx-10.9-universal2-3.9
copying predict.py -> build/lib.macosx-10.9-universal2-3.9
running build_ext
building 'cpredict' extension
creating build/temp.macosx-10.9-universal2-3.9
clang -Wno-unused-result -Wsign-compare -Wunreachable-code -fno-common -dynamic -DNDEBUG -g -fwrapv -O3 -Wall -iwithsysroot/System/Library/Frameworks/System.framework/PrivateHeaders -iwithsysroot/Applications/Xcode.app/Contents/Developer/Library/Frameworks/Python3.framework/Versions/3.9/Headers -arch arm64 -arch x86_64 -Werror=implicit-function-declaration -Wno-error=unreachable-code -I/Library/Developer/CommandLineTools/Library/Frameworks/Python3.framework/Versions/3.9/include/python3.9 -c predict.c -o build/temp.macosx-10.9-universal2-3.9/predict.o
predict.c:127:31: warning: use of GNU old-style field designator extension [-Wgnu-designator]
struct tm debug_frozen_tm = { tm_year: 114, tm_mon: 10, tm_mday: 2 };
                              ^~~~~~~~
                              .tm_year = 
predict.c:127:45: warning: use of GNU old-style field designator extension [-Wgnu-designator]
struct tm debug_frozen_tm = { tm_year: 114, tm_mon: 10, tm_mday: 2 };
                                            ^~~~~~~
                                            .tm_mon = 
predict.c:127:57: warning: use of GNU old-style field designator extension [-Wgnu-designator]
struct tm debug_frozen_tm = { tm_year: 114, tm_mon: 10, tm_mday: 2 };
                                                        ^~~~~~~~
                                                        .tm_mday = 
predict.c:1120:48: warning: variable 'zmo' set but not used [-Wunused-but-set-variable]
        z21, z22, z23, z3, z31, z32, z33, ze, zf, zm, zmo, zn, zsing,
                                                      ^
predict.c:2126:23: warning: comparison of integers of different signs: 'unsigned int' and 'char' [-Wsign-compare]
                for (x=start, y=0; x<=end && string[x]!=0; x++)
                                   ~^ ~~~
predict.c:2151:17: warning: comparison of integers of different signs: 'unsigned int' and 'char' [-Wsign-compare]
        for (j=start; j<=end; j++)
                      ~^ ~~~
predict.c:2447:24: warning: comparison of integers of different signs: 'int' and 'unsigned long' [-Wsign-compare]
        a = ((la == 0) || (la >= sizeof(sat.name)));
                           ~~ ^  ~~~~~~~~~~~~~~~~
predict.c:2448:24: warning: comparison of integers of different signs: 'int' and 'unsigned long' [-Wsign-compare]
        b = ((lb == 0) || (lb >= sizeof(sat.line1)));
                           ~~ ^  ~~~~~~~~~~~~~~~~~
predict.c:2449:24: warning: comparison of integers of different signs: 'int' and 'unsigned long' [-Wsign-compare]
        c = ((lc == 0) || (lc >= sizeof(sat.line2)));
                           ~~ ^  ~~~~~~~~~~~~~~~~~
predict.c:2620:6: warning: variable 'x' set but not used [-Wunused-but-set-variable]
        int x;
            ^
predict.c:2632:7: warning: a function definition without a prototype is deprecated in all versions of C and is not supported in C2x [-Wdeprecated-non-prototype]
char *Daynum2String(daynum)
      ^
predict.c:2680:47: warning: variable 'e' set but not used [-Wunused-but-set-variable]
                b, w1, w2, bt, p, lm, h, ra, dec, z, ob, n, e, el,
                                                            ^
predict.c:3348:13: warning: incompatible pointer types passing 'char (*)[25]' to parameter of type 'char *' [-Wincompatible-pointer-types]
    strncpy(&(obs->name), &(sat.name), sizeof(obs->name));
            ^~~~~~~~~~~~
/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include/secure/_string.h:128:28: note: expanded from macro 'strncpy'
                __builtin___strncpy_chk (dest, __VA_ARGS__, __darwin_obsz (dest))
                                         ^~~~
predict.c:3348:27: warning: incompatible pointer types passing 'char (*)[25]' to parameter of type 'const char *' [-Wincompatible-pointer-types]
    strncpy(&(obs->name), &(sat.name), sizeof(obs->name));
                          ^~~~~~~~~~~
/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include/secure/_string.h:128:34: note: expanded from macro 'strncpy'
                __builtin___strncpy_chk (dest, __VA_ARGS__, __darwin_obsz (dest))
                                               ^~~~~~~~~~~
predict.c:3360:13: warning: incompatible pointer types passing 'char (*)[5]' to parameter of type 'char *' [-Wincompatible-pointer-types]
    strncpy(&(obs->orbital_model), &(ephem), sizeof(obs->orbital_model));
            ^~~~~~~~~~~~~~~~~~~~~
/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include/secure/_string.h:128:28: note: expanded from macro 'strncpy'
                __builtin___strncpy_chk (dest, __VA_ARGS__, __darwin_obsz (dest))
                                         ^~~~
predict.c:3360:36: warning: incompatible pointer types passing 'char (*)[5]' to parameter of type 'const char *' [-Wincompatible-pointer-types]
    strncpy(&(obs->orbital_model), &(ephem), sizeof(obs->orbital_model));
                                   ^~~~~~~~
/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include/secure/_string.h:128:34: note: expanded from macro 'strncpy'
                __builtin___strncpy_chk (dest, __VA_ARGS__, __darwin_obsz (dest))
                                               ^~~~~~~~~~~
predict.c:3301:28: warning: variable 'delay' set but not used [-Wunused-but-set-variable]
    double doppler100=0.0, delay;
                           ^
predict.c:3385:36: warning: format specifies type 'int' but the argument has type 'long' [-Wformat]
    printf("NORAD_ID        %d\n", obs->norad_id);
                            ~~     ^~~~~~~~~~~~~
                            %ld
predict.c:3483:14: warning: passing 'const char *' to parameter of type 'char *' discards qualifiers [-Wincompatible-pointer-types-discards-qualifiers]
        if (ReadTLE(tle0,tle1,tle2) != 0)
                    ^~~~
predict.c:2439:20: note: passing argument to parameter 'line0' here
char ReadTLE(char *line0, char *line1, char *line2)
                   ^
predict.c:3483:19: warning: passing 'const char *' to parameter of type 'char *' discards qualifiers [-Wincompatible-pointer-types-discards-qualifiers]
        if (ReadTLE(tle0,tle1,tle2) != 0)
                         ^~~~
predict.c:2439:33: note: passing argument to parameter 'line1' here
char ReadTLE(char *line0, char *line1, char *line2)
                                ^
predict.c:3483:24: warning: passing 'const char *' to parameter of type 'char *' discards qualifiers [-Wincompatible-pointer-types-discards-qualifiers]
        if (ReadTLE(tle0,tle1,tle2) != 0)
                              ^~~~
predict.c:2439:46: note: passing argument to parameter 'line2' here
char ReadTLE(char *line0, char *line1, char *line2)
                                             ^
predict.c:3545:9: warning: variable 'now' set but not used [-Wunused-but-set-variable]
        double now;
               ^
predict.c:3683:6: error: call to undeclared function 'Py_InitModule3'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
        m = Py_InitModule3("cpredict", pypredict_funcs,
            ^
predict.c:3683:4: error: incompatible integer to pointer conversion assigning to 'PyObject *' (aka 'struct _object *') from 'int' [-Wint-conversion]
        m = Py_InitModule3("cpredict", pypredict_funcs,
          ^ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
22 warnings and 2 errors generated.
error: command '/usr/bin/clang' failed with exit code 1
nsat / pypredict

does not seem to be able to install on python3 #66
