--- a/usr.sbin/config/main.c
+++ b/usr.sbin/config/main.c
@@ -60,6 +60,10 @@
 #include "config.h"
 #include "configvers.h"
 
+#ifndef MAXPATHLEN
+#define MAXPATHLEN 4096
+#endif
+
 #ifndef TRUE
 #define TRUE	(1)
 #endif
--- a/usr.sbin/config/mkmakefile.c
+++ b/usr.sbin/config/mkmakefile.c
@@ -50,6 +50,10 @@
 #include "config.h"
 #include "configvers.h"
 
+#ifndef MAXPATHLEN
+#define MAXPATHLEN 4096
+#endif
+
 #define next_word(fp, wd) \
 	{ char *word = get_word(fp); \
 	  if (word == (char *)EOF) \
--- a/usr.sbin/config/mkoptions.c
+++ b/usr.sbin/config/mkoptions.c
@@ -48,6 +48,10 @@
 #include "config.h"
 #include "y.tab.h"
 
+#ifndef MAXPATHLEN
+#define MAXPATHLEN 4096
+#endif
+
 static	struct users {
 	int	u_default;
 	int	u_min;
--- a/sys/dev/aic7xxx/aicasm/aicasm_scan.l
+++ b/sys/dev/aic7xxx/aicasm/aicasm_scan.l
@@ -57,6 +57,10 @@
 #include "aicasm_symbol.h"
 #include "aicasm_gram.h"
 
+#ifndef PATH_MAX
+#define PATH_MAX 4096
+#endif
+
 /* This is used for macro body capture too, so err on the large size. */
 #define MAX_STR_CONST 4096
 static char string_buf[MAX_STR_CONST];