diff --git a/ANNOUNCE b/ANNOUNCE
index 9d5e66fbc..3c6f0e85e 100644
--- a/ANNOUNCE
+++ b/ANNOUNCE
@@ -1,5 +1,5 @@
 
-Libpng 1.7.0beta42 - November 7, 2014
+Libpng 1.7.0beta42 - November 14, 2014
 
 This is not intended to be a public release.  It will be replaced
 within a few weeks by a public version or by another test version.
@@ -648,7 +648,11 @@ Version 1.7.0beta41 [November 7, 2014]
     png_do_swap().
   Changed all "#endif /* PNG_FEATURE_SUPPORTED */" to "#endif /* FEATURE */"
 
-Version 1.7.0beta42 [November 7, 2014]
+Version 1.7.0beta42 [November 14, 2014]
+  The macros passed in the command line to Borland make were ignored if
+    similarly-named macros were already defined in makefiles. This behavior
+    is different from POSIX make and other make programs.  Surround the
+    macro definitions with ifndef guards (Cosmin).
 
 Send comments/corrections/commendations to png-mng-implement at lists.sf.net
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diff --git a/CHANGES b/CHANGES
index 357ea1af5..1760be3dc 100644
--- a/CHANGES
+++ b/CHANGES
@@ -4937,7 +4937,11 @@ Version 1.7.0beta41 [November 7, 2014]
     png_do_swap().
   Changed all "#endif /* PNG_FEATURE_SUPPORTED */" to "#endif /* FEATURE */"
 
-Version 1.7.0beta42 [November 7, 2014]
+Version 1.7.0beta42 [November 14, 2014]
+  The macros passed in the command line to Borland make were ignored if
+    similarly-named macros were already defined in makefiles. This behavior
+    is different from POSIX make and other make programs.  Surround the
+    macro definitions with ifndef guards (Cosmin).
 
 Send comments/corrections/commendations to png-mng-implement at lists.sf.net
 (subscription required; visit
diff --git a/scripts/makefile.bc32 b/scripts/makefile.bc32
index d488a54a0..bdbc4cb2f 100644
--- a/scripts/makefile.bc32
+++ b/scripts/makefile.bc32
@@ -52,7 +52,9 @@ LDFLAGS=-L$(ZLIB_DIR) -M $(LDEBUG)
 
 # Pre-built configuration
 # See scripts\pnglibconf.mak for more options
+!ifndef PNGLIBCONF_H_PREBUILT
 PNGLIBCONF_H_PREBUILT = scripts\pnglibconf.h.prebuilt
+!endif
 
 ## Variables
 OBJS = \
diff --git a/scripts/makefile.bor b/scripts/makefile.bor
index a01f73899..6693772db 100644
--- a/scripts/makefile.bor
+++ b/scripts/makefile.bor
@@ -60,7 +60,9 @@ LDFLAGS=-M -L$(ZLIB_DIR) $(MODEL_ARG) $(LDEBUG)
 
 # Pre-built configuration
 # See scripts\pnglibconf.mak for more options
+!ifndef PNGLIBCONF_H_PREBUILT
 PNGLIBCONF_H_PREBUILT = scripts\pnglibconf.h.prebuilt
+!endif
 
 ## Variables
 
diff --git a/scripts/makefile.tc3 b/scripts/makefile.tc3
index c917a08f1..1d015026c 100644
--- a/scripts/makefile.tc3
+++ b/scripts/makefile.tc3
@@ -16,7 +16,9 @@ CP=copy
 
 # Pre-built configuration
 # See scripts\pnglibconf.mak for more options
+!ifndef PNGLIBCONF_H_PREBUILT
 PNGLIBCONF_H_PREBUILT = scripts\pnglibconf.h.prebuilt
+!endif
 
 O=.obj
 E=.exe