Index: head/lib/libcapsicum/capsicum_helpers.h
===================================================================
--- head/lib/libcapsicum/capsicum_helpers.h
+++ head/lib/libcapsicum/capsicum_helpers.h
@@ -39,6 +39,8 @@
 #include <time.h>
 #include <unistd.h>
 
+#include <libcasper.h>
+
 #define	CAPH_IGNORE_EBADF	0x0001
 #define	CAPH_READ		0x0002
 #define	CAPH_WRITE		0x0004
@@ -120,6 +122,24 @@
 {
 
 	(void)catopen("libc", NL_CAT_LOCALE);
+}
+
+static __inline int
+caph_enter(void)
+{
+
+	if (cap_enter() < 0 && errno != ENOSYS)
+		return (-1);
+
+	return (0);
+}
+
+
+static __inline int
+caph_enter_casper(void)
+{
+
+	return (CASPER_SUPPORT == 0 ? 0 : caph_enter());
 }
 
 #endif /* _CAPSICUM_HELPERS_H_ */
Index: head/lib/libcapsicum/capsicum_helpers.3
===================================================================
--- head/lib/libcapsicum/capsicum_helpers.3
+++ head/lib/libcapsicum/capsicum_helpers.3
@@ -24,7 +24,7 @@
 .\"
 .\" $FreeBSD$
 .\"
-.Dd October 21, 2016
+.Dd May 7, 2018
 .Dt CAPSICUM_HELPERS 3
 .Os
 .Sh NAME
@@ -41,6 +41,10 @@
 .Sh SYNOPSIS
 .In capsicum_helpers.h
 .Ft int
+.Fn caph_enter "void"
+.Ft int
+.Fn caph_enter_casper "void"
+.Ft int
 .Fn caph_limit_stream "int fd, int flags"
 .Ft int
 .Fn caph_limit_stdin "void"
@@ -55,6 +59,19 @@
 .Ft void
 .Fn caph_cache_catpages "void"
 .Sh DESCRIPTION
+The
+.Nm caph_enter
+is equivalent to the
+.Xr cap_enter 2
+it returns success when the kernel is built without support of the capability
+mode.
+.Pp
+The
+.Nm caph_enter_casper
+is equivalent to the
+.Nm caph_enter
+it returns success when the system is built without Casper support.
+.Pp
 The
 .Nm capsicum helpers
 are a set of a inline functions which simplify modifying programs to use