diff --git a/cde/lib/DtHelp/Helpos.c b/cde/lib/DtHelp/Helpos.c
index fd4285a24..3787c33d4 100644
--- a/cde/lib/DtHelp/Helpos.c
+++ b/cde/lib/DtHelp/Helpos.c
@@ -42,11 +42,16 @@
  ****************************************************************************
  ************************************<+>*************************************/
 
-
 #include <sys/param.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
+
+#include <autotools_config.h>
+#if defined(HAVE_LOCALE_H)
+#include <locale.h>
+#endif
+
 #define X_INCLUDE_PWD_H
 #define XOS_USE_XT_LOCKING
 #include <X11/Xos_r.h>
diff --git a/cde/lib/DtHelp/Makefile.am b/cde/lib/DtHelp/Makefile.am
index ebcc3263d..bb36499a6 100644
--- a/cde/lib/DtHelp/Makefile.am
+++ b/cde/lib/DtHelp/Makefile.am
@@ -6,7 +6,8 @@ lib_LTLIBRARIES = libDtHelp.la
 
 libDtHelp_la_CFLAGS = -I./il -I./jpeg -I../DtSvc/DtUtil2 -DDTLIB \
 		      -DCDE_INSTALLATION_TOP='"${prefix}"' \
-		      -DCDE_CONFIGURATION_TOP='"$(CDE_CONFIGURATION_TOP)"'
+		      -DCDE_CONFIGURATION_TOP='"$(CDE_CONFIGURATION_TOP)"' \
+		      @DT_INCDIR@ @DTI_INCDIR@
 
 libDtHelp_la_LIBADD = -ljpeg il/libil.la
 
diff --git a/cde/lib/DtHelp/il/Makefile.am b/cde/lib/DtHelp/il/Makefile.am
index c3e2326d1..d26e90f45 100644
--- a/cde/lib/DtHelp/il/Makefile.am
+++ b/cde/lib/DtHelp/il/Makefile.am
@@ -3,19 +3,8 @@ MAINTAINERCLEANFILES = Makefile.in
 noinst_LTLIBRARIES = libil.la
 
 libil_la_CFLAGS = -I.. -DDTLIB -DCDE_INSTALLATION_TOP='"${prefix}"' \
-		  -DCDE_CONFIGURATION_TOP='"$(CDE_CONFIGURATION_TOP)"'
-
-if BSD
-libil_la_CFLAGS += -DLSB_BIT_ORDER
-else
- if LINUX
- libil_la_CFLAGS += -DLSB_BIT_ORDER
- else
-  if SUN
-  libil_la_CFLAGS += -DLSB_BIT_ORDER
-  endif
- endif
-endif
+		  -DCDE_CONFIGURATION_TOP='"$(CDE_CONFIGURATION_TOP)"' \
+		  @DT_INCDIR@ @DTI_INCDIR@
 
 libil_la_SOURCES = ilX.c                ilbigray.c           ilcodec.c \
 		   ilcontext.c          ilconvert.c          ilcrop.c \
diff --git a/cde/lib/DtHelp/il/ilint.h b/cde/lib/DtHelp/il/ilint.h
index 68c8f39bf..f7fdf1de0 100644
--- a/cde/lib/DtHelp/il/ilint.h
+++ b/cde/lib/DtHelp/il/ilint.h
@@ -43,6 +43,12 @@
         /*  General internal definitions for Image Library (IL).
         */
 
+/* use autotools detection to determine endianess */
+#include <autotools_config.h>
+#ifndef WORDS_BIGENDIAN
+# define LSB_BIT_ORDER
+#endif
+
 #include <stddef.h>        /* for size_t declaration */
 #ifndef IL_H
 #include "il.h"