See: https://trac.macports.org/ticket/58550
fixes for Tiger build, but can be applied generally to all builds
also requires legacysupport PortGroup for *at functions
kencu@macports.org

diff --git src/base.h src/base.h
index f21973b..224d4f8 100644
--- src/base.h
+++ src/base.h
@@ -7,6 +7,10 @@
 #include <sys/types.h>
 #include <sys/time.h>
 
+#if defined(__APPLE__) && defined(__MACH__) && (__ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__ < 1050)
+#include <time.h>
+#endif
+
 #include "base_decls.h"
 #include "buffer.h"
 #include "array.h"
diff --git src/mod_webdav.c src/mod_webdav.c
index 121e403..c0eb7d5 100644
--- src/mod_webdav.c
+++ src/mod_webdav.c
@@ -2012,7 +2012,7 @@ webdav_prop_select_propnames (const plugin_config * const pconf,
 }
 
 
-#if defined(__APPLE__) && defined(__MACH__)
+#if defined(__APPLE__) && defined(__MACH__) && (__ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__ >= 1050)
 #include <copyfile.h>     /* fcopyfile() *//* OS X 10.5+ */
 #endif
 #ifdef HAVE_ELFTC_COPYFILE/* __FreeBSD__ */
@@ -2045,7 +2045,7 @@ webdav_fcopyfile_sz (int ifd, int ofd, off_t isz)
     /*fcntl(ofd, F_SETFL, fcntl(ofd, F_GETFL, 0) & ~O_NONBLOCK);*/
   #endif
 
-  #if defined(__APPLE__) && defined(__MACH__)
+  #if defined(__APPLE__) && defined(__MACH__) && (__ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__ >= 1050)
     if (0 == fcopyfile(ifd, ofd, NULL, COPYFILE_ALL))
         return 0;