diff --git a/configure.ac b/configure.ac
index 842f5d6..95a4be3 100644
--- a/configure.ac
+++ b/configure.ac
@@ -247,6 +247,7 @@ AC_CHECK_FUNCS([clearenv dirfd fopencookie __fpurge \
                 getauxval getentropy getexecname getline \
                 pstat_getproc sysconf])
 AM_CONDITIONAL([HAVE_GETENTROPY], [test "x$ac_cv_func_getentropy" = "xyes"])
+AM_CONDITIONAL([HAVE_FOPENCOOKIE], [test "x$ac_cv_func_fopencookie" = "xyes"])
 
 AC_SUBST([MD5_LIBS])
 AC_SUBST([LIBBSD_LIBS])
diff --git a/man/funopen.3bsd b/man/funopen.3bsd
index 6ff61fd..0f5ac06 100644
--- a/man/funopen.3bsd
+++ b/man/funopen.3bsd
@@ -170,7 +170,11 @@ The
 .Fn funopen
 function
 may not be portable to systems other than
-.Bx .
+.Bx
+and glibc-based (as the libbsd implementation is only provided when the
+system has
+.Fn fopencookie
+available).
 .Pp
 On
 .Fx ,
diff --git a/src/funopen.c b/src/funopen.c
index 1e6f43a..01b63b3 100644
--- a/src/funopen.c
+++ b/src/funopen.c
@@ -137,12 +137,6 @@ funopen(const void *cookie,
 
 	return fopencookie(cookiewrap, mode, funcswrap);
 }
-#elif defined(__MUSL__)
-/*
- * This is unimplementable on musl based systems, and upstream has stated
- * they will not add the needed support to implement it. Just ignore this
- * interface there, as it has never been provided anyway.
- */
 #else
-#error "Function funopen() needs to be ported or disabled."
+#warning "Function funopen() is not provided on this platform."
 #endif
diff --git a/test/Makefile.am b/test/Makefile.am
index 64faaec..458a4e9 100644
--- a/test/Makefile.am
+++ b/test/Makefile.am
@@ -39,7 +39,6 @@ check_PROGRAMS = \
 	explicit_bzero \
 	humanize \
 	fgetln \
-	funopen \
 	fparseln \
 	fpurge \
 	md5 \
@@ -56,6 +55,10 @@ check_PROGRAMS = \
 	vis-openbsd \
 	# EOL
 
+if HAVE_FOPENCOOKIE
+check_PROGRAMS += funopen
+endif
+
 if HAVE_LIBTESTU01
 arc4random_LDADD = $(LDADD) $(TESTU01_LIBS)