diff --git a/contrib/pngminim/decoder/pngusr.h b/contrib/pngminim/decoder/pngusr.h
index 6198bf3864b3001fbba248e8fff5ccdf5d6a02c8..d8ca3d099df7eebbf359af5eacfa300d214976df 100644
--- a/contrib/pngminim/decoder/pngusr.h
+++ b/contrib/pngminim/decoder/pngusr.h
@@ -12,17 +12,12 @@
 #ifndef MINRDPNGCONF_H
 #define MINRDPNGCONF_H
 
-/* If pngusr.h is included during the build the following must
- * be defined either here or in the .dfa file (pngusr.dfa in
- * this case).  To include pngusr.h set -DPNG_USER_CONFIG in
- * CPPFLAGS
- */
-#define PNG_USER_PRIVATEBUILD "libpng minimal conformant PNG decoder"
-#define PNG_USER_DLLFNAME_POSTFIX "mr"
+/* To include pngusr.h set -DPNG_USER_CONFIG in CPPFLAGS */
 
 /* List options to turn off features of the build that do not
  * affect the API (so are not recorded in pnglibconf.h)
  */
+
 #define PNG_NO_WARNINGS
 
 #endif /* MINRDPNGCONF_H */
diff --git a/contrib/pngminim/encoder/pngusr.h b/contrib/pngminim/encoder/pngusr.h
index bba3fbaee6ae801aee74b540b2d7a56a739d038a..bd9ec5a2a71dc577d2eb6256bce490479f03509b 100644
--- a/contrib/pngminim/encoder/pngusr.h
+++ b/contrib/pngminim/encoder/pngusr.h
@@ -12,17 +12,12 @@
 #ifndef MINWRPNGCONF_H
 #define MINWRPNGCONF_H
 
-/* If pngusr.h is included during the build the following must
- * be defined either here or in the .dfa file (pngusr.dfa in
- * this case).  To include pngusr.h set -DPNG_USER_CONFIG in
- * CPPFLAGS
- */
-#define PNG_USER_PRIVATEBUILD "libpng minimal conformant PNG encoder"
-#define PNG_USER_DLLFNAME_POSTFIX "me"
+/* To include pngusr.h set -DPNG_USER_CONFIG in CPPFLAGS */
 
 /* List options to turn off features of the build that do not
  * affect the API (so are not recorded in pnglibconf.h)
  */
+
 #define PNG_NO_WARNINGS
 
 #endif /* MINWRPNGCONF_H */
diff --git a/contrib/pngminim/preader/pngusr.h b/contrib/pngminim/preader/pngusr.h
index e10a14ef872a25b0d6941f51d5d9ce3461e8e3b0..9284573eac36e87985f2d475f58f06557141d212 100644
--- a/contrib/pngminim/preader/pngusr.h
+++ b/contrib/pngminim/preader/pngusr.h
@@ -12,17 +12,12 @@
 #ifndef MINPRDPNGCONF_H
 #define MINPRDPNGCONF_H
 
-/* If pngusr.h is included during the build the following must
- * be defined either here or in the .dfa file (pngusr.dfa in
- * this case).  To include pngusr.h set -DPNG_USER_CONFIG in
- * CPPFLAGS
- */
-#define PNG_USER_PRIVATEBUILD "libpng minimal conformant PNG progressive reader"
-#define PNG_USER_DLLFNAME_POSTFIX "mp"
+/* To include pngusr.h set -DPNG_USER_CONFIG in CPPFLAGS */
 
 /* List options to turn off features of the build that do not
  * affect the API (so are not recorded in pnglibconf.h)
  */
+
 #define PNG_NO_WARNINGS
 
 #endif /* MINPRDPNGCONF_H */