lib: fix the djgpp build

Bug: https://github.com/curl/curl/commit/73a2fcea0b4adea6ba342cd7ed1149782c214ae3#commitcomment-22655993

diff --git a/lib/makefile.dj b/lib/makefile.dj
index 067459d5909aa303915819b9a0e03437d88191f1..8ab2d575dabf42084728916cf67b7a26d8b771b6 100644 (file)
--- a/lib/makefile.dj
+++ b/lib/makefile.dj
@@ -26,12 +26,14 @@
 #
 
 DEPEND_PREREQ = curl_config.h
-VPATH  = vtls
+VPATH  = vtls vauth
 TOPDIR = ..
 
 include ../packages/DOS/common.dj
 include Makefile.inc
 
+CFLAGS += -DBUILDING_LIBCURL
+
 SOURCES = $(sort $(CSOURCES))
 OBJECTS = $(addprefix $(OBJ_DIR)/, $(notdir $(SOURCES:.c=.o)))