swift-build-error

error: manifest parse error(s):
<module-includes>:21:9: note: in file included from <module-includes>:21:
#import "signal.h"
        ^
/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.14.sdk/usr/include/signal.h:69:42: error: use of undeclared identifier 'NSIG'
extern __const char *__const sys_signame[NSIG];
                                         ^
<module-includes>:21:9: note: in file included from <module-includes>:21:
#import "signal.h"
        ^
/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.14.sdk/usr/include/signal.h:70:42: error: use of undeclared identifier 'NSIG'
extern __const char *__const sys_siglist[NSIG];
                                         ^
<module-includes>:21:9: note: in file included from <module-includes>:21:
#import "signal.h"
        ^
/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.14.sdk/usr/include/signal.h:80:17: error: expected identifier
int     kill(pid_t, int) __DARWIN_ALIAS(kill);
                    ^
<module-includes>:21:9: note: in file included from <module-includes>:21:
#import "signal.h"
        ^
/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.14.sdk/usr/include/signal.h:81:19: error: expected identifier
int     killpg(pid_t, int) __DARWIN_ALIAS(killpg);
                      ^
<module-includes>:21:9: note: in file included from <module-includes>:21:
#import "signal.h"
        ^
/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.14.sdk/usr/include/signal.h:83:32: error: unknown type name 'sigset_t'
int     pthread_sigmask(int, const sigset_t *, sigset_t *) __DARWIN_ALIAS(pthread_sigmask);
                                   ^
<module-includes>:21:9: note: in file included from <module-includes>:21:
#import "signal.h"
        ^
/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.14.sdk/usr/include/signal.h:83:44: error: unknown type name 'sigset_t'
int     pthread_sigmask(int, const sigset_t *, sigset_t *) __DARWIN_ALIAS(pthread_sigmask);
                                               ^
<module-includes>:21:9: note: in file included from <module-includes>:21:
#import "signal.h"
        ^
/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.14.sdk/usr/include/signal.h:86:15: error: unknown type name 'sigset_t'
int     sigaddset(sigset_t *, int);
                  ^
<module-includes>:21:9: note: in file included from <module-includes>:21:
#import "signal.h"
        ^
/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.14.sdk/usr/include/signal.h:87:23: error: unknown type name 'stack_t'
int     sigaltstack(const stack_t * __restrict, stack_t * __restrict)  __DARWIN_ALIAS(sigaltstack) __WATCHOS_PROHIBITED __TVOS_PROHIBITED;
                          ^
<module-includes>:21:9: note: in file included from <module-includes>:21:
#import "signal.h"
        ^
/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.14.sdk/usr/include/signal.h:87:45: error: unknown type name 'stack_t'
int     sigaltstack(const stack_t * __restrict, stack_t * __restrict)  __DARWIN_ALIAS(sigaltstack) __WATCHOS_PROHIBITED __TVOS_PROHIBITED;
                                                ^
<module-includes>:21:9: note: in file included from <module-includes>:21:
#import "signal.h"
        ^
/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.14.sdk/usr/include/signal.h:88:15: error: unknown type name 'sigset_t'
int     sigdelset(sigset_t *, int);
                  ^
<module-includes>:21:9: note: in file included from <module-includes>:21:
#import "signal.h"
        ^
/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.14.sdk/usr/include/signal.h:89:17: error: unknown type name 'sigset_t'
int     sigemptyset(sigset_t *);
                    ^
<module-includes>:21:9: note: in file included from <module-includes>:21:
#import "signal.h"
        ^
/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.14.sdk/usr/include/signal.h:90:16: error: unknown type name 'sigset_t'
int     sigfillset(sigset_t *);
                   ^
<module-includes>:21:9: note: in file included from <module-includes>:21:
#import "signal.h"
        ^
/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.14.sdk/usr/include/signal.h:94:23: error: unknown type name 'sigset_t'
int     sigismember(const sigset_t *, int);
                          ^
<module-includes>:21:9: note: in file included from <module-includes>:21:
#import "signal.h"
        ^
/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.14.sdk/usr/include/signal.h:96:16: error: unknown type name 'sigset_t'
int     sigpending(sigset_t *);
                   ^
<module-includes>:21:9: note: in file included from <module-includes>:21:
#import "signal.h"
        ^
/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.14.sdk/usr/include/signal.h:97:28: error: unknown type name 'sigset_t'
int     sigprocmask(int, const sigset_t * __restrict, sigset_t * __restrict);
                               ^
<module-includes>:21:9: note: in file included from <module-includes>:21:
#import "signal.h"
        ^
/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.14.sdk/usr/include/signal.h:97:51: error: unknown type name 'sigset_t'
int     sigprocmask(int, const sigset_t * __restrict, sigset_t * __restrict);
                                                      ^
<module-includes>:21:9: note: in file included from <module-includes>:21:
#import "signal.h"
        ^
/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.14.sdk/usr/include/signal.h:100:22: error: unknown type name 'sigset_t'
int     sigsuspend(const sigset_t *) __DARWIN_ALIAS_C(sigsuspend);
                         ^
<module-includes>:21:9: note: in file included from <module-includes>:21:
#import "signal.h"
        ^
/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.14.sdk/usr/include/signal.h:101:19: error: unknown type name 'sigset_t'
int     sigwait(const sigset_t * __restrict, int * __restrict) __DARWIN_ALIAS_C(sigwait);
                      ^
<module-includes>:21:9: note: in file included from <module-includes>:21:
#import "signal.h"
        ^
/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.14.sdk/usr/include/signal.h:116:22: error: use of undeclared identifier '__DARWIN_NSIG'
    return __signo > __DARWIN_NSIG ? 0 : (1 << (__signo - 1));
                     ^
<unknown>:0: error: too many errors emitted, stopping now
<unknown>:0: error: could not build Objective-C module 'Darwin'