- Based on Fedor Karpelevitch's formpost path basename patch, file parts in

formposts no longer include the path part. If you _really_ want them, you
  must provide your preferred full file name with CURLFORM_FILENAME.

  Added detection for libgen.h and basename() to configure. My custom
  basename() replacement function for systems without it, might be a bit too
  naive...

  Updated 6 test cases to make them work with the stripped paths.

configure.ac

@@ -1115,6 +1115,7 @@ AC_CHECK_HEADERS(
         utime.h \
         sys/utime.h \
         sys/poll.h \
+        libgen.h \
         setjmp.h,
 dnl to do if not found
 [],
@@ -1197,6 +1198,7 @@ AC_CHECK_FUNCS( strtoll \
                 dlopen \
                 utime \
                 sigsetjmp \
+                basename \
                 poll,
 dnl if found
 [],