https://www.illumos.org/issues/17048

--- ccache-4.13.1/cmake/GenerateConfigurationFile.cmake.orig
+++ ccache-4.13.1/cmake/GenerateConfigurationFile.cmake
@@ -8,7 +8,6 @@
     sys/file.h
     sys/ioctl.h
     sys/mman.h
-    sys/sendfile.h
     sys/utime.h
     sys/wait.h
     syslog.h