libtool: compile:  clang -I. -I/Users/travis/AppleTVOS-arm64/include -I/Users/travis/AppleTVOS-arm64/include -DSRCDIR=.
-arch arm64 -mappletvos-version-min=6 --sysroot=/Applications/Xcode-10.0.app/Contents/Developer/Platforms/
AppleTVOS.platform/Developer/SDKs/AppleTVOS12.0.sdk -c smallapp/unbound-control.c -o unbound-control.o
smallapp/unbound-control.c:882:6: error: 'execlp' is unavailable: not available on tvOS
                if(execlp("unbound", "unbound", "-c", cfgfile, 
                   ^
/Applications/Xcode-10.0.app/Contents/Developer/Platforms/AppleTVOS.platform/Developer/SDKs/AppleTVOS12.0.sdk/
usr/include/unistd.h:442:6: note: 'execlp' has been explicitly marked unavailable here
int      execlp(const char * __file, const char * __arg0, ...) __WATCHOS_PROHIBITED __TVOS_PROHIBITED;
         ^
1 error generated.