diff --git a/dtool/Config.Irix.pp b/dtool/Config.Irix.pp
index c01560fce3..52cb2033d9 100644
--- a/dtool/Config.Irix.pp
+++ b/dtool/Config.Irix.pp
@@ -42,6 +42,9 @@
 // Do we have <alloca.h>?
 #define HAVE_ALLOCA_H 1
 
+// Do we have <minmax.h>?
+#define HAVE_MINMAX_H
+
 // Do we have <sys/types.h>?
 #define HAVE_SYS_TYPES_H 1
 
diff --git a/dtool/Config.Linux.pp b/dtool/Config.Linux.pp
index f33593d9a4..d492b35bd4 100644
--- a/dtool/Config.Linux.pp
+++ b/dtool/Config.Linux.pp
@@ -42,6 +42,9 @@
 // Do we have <alloca.h>?
 #define HAVE_ALLOCA_H 1
 
+// Do we have <minmax.h>?
+#define HAVE_MINMAX_H
+
 // Do we have <sys/types.h>?
 #define HAVE_SYS_TYPES_H 1
 
diff --git a/dtool/Config.Win32.pp b/dtool/Config.Win32.pp
index 748945306f..31aec32d1f 100644
--- a/dtool/Config.Win32.pp
+++ b/dtool/Config.Win32.pp
@@ -42,6 +42,9 @@
 // Do we have <alloca.h>?
 #define HAVE_ALLOCA_H
 
+// Do we have <minmax.h>?
+#define HAVE_MINMAX_H 1
+
 // Do we have <sys/types.h>?
 #define HAVE_SYS_TYPES_H 1
 
diff --git a/dtool/LocalSetup.pp b/dtool/LocalSetup.pp
index f3506cc238..00f06a1132 100644
--- a/dtool/LocalSetup.pp
+++ b/dtool/LocalSetup.pp
@@ -177,7 +177,11 @@ $[undef] HAVE_ALLOCA_H
 #endif
 
 /* Define if you have the <minmax.h> header file.  */
+#if $[HAVE_MINMAX_H]
+$[define] HAVE_MINMAX_H 1
+#else
 $[undef] HAVE_MINMAX_H
+#endif
 
 /* Define if you have the <sstream> header file.  */
 #if $[HAVE_SSTREAM]