Index: uspace/lib/c/include/fenv.h
===================================================================
--- uspace/lib/c/include/fenv.h	(revision bbdca54094b489b4e420a9f18874917a41d26713)
+++ uspace/lib/c/include/fenv.h	(revision bbdca54094b489b4e420a9f18874917a41d26713)
@@ -0,0 +1,42 @@
+/*
+ * Copyright (c) 2018 CZ.NIC, z.s.p.o.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * - Redistributions of source code must retain the above copyright
+ *   notice, this list of conditions and the following disclaimer.
+ * - Redistributions in binary form must reproduce the above copyright
+ *   notice, this list of conditions and the following disclaimer in the
+ *   documentation and/or other materials provided with the distribution.
+ * - The name of the author may not be used to endorse or promote products
+ *   derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef _FENV_H
+#define _FENV_H
+
+// TODO
+
+#define FE_TOWARDZERO  0
+#define FE_TONEAREST   1
+#define FE_UPWARD      2
+#define FE_DOWNWARD    3
+
+#define fegetround() FE_TONEAREST
+
+#endif
+
Index: uspace/lib/c/include/float.h
===================================================================
--- uspace/lib/c/include/float.h	(revision 84929b019a712851b525eb56d5c44b656df46cbd)
+++ uspace/lib/c/include/float.h	(revision bbdca54094b489b4e420a9f18874917a41d26713)
@@ -32,4 +32,8 @@
 // FIXME: <float.h> is freestanding. Just include the compiler-provided file.
 
+#define FLT_MIN __FLT_MIN__
+#define FLT_DENORM_MIN __FLT_DENORM_MIN__
+#define FLT_EPSILON __FLT_EPSILON__
+
 #define FLT_MANT_DIG  __FLT_MANT_DIG__
 #define DBL_MANT_DIG  __DBL_MANT_DIG__
Index: uspace/lib/c/include/math.h
===================================================================
--- uspace/lib/c/include/math.h	(revision 84929b019a712851b525eb56d5c44b656df46cbd)
+++ uspace/lib/c/include/math.h	(revision bbdca54094b489b4e420a9f18874917a41d26713)
@@ -312,4 +312,8 @@
 #define copysignl __builtin_copysignl
 
+#define nextafter __builtin_nextafter
+#define nextafterf __builtin_nextafterf
+#define nextafterl __builtin_nextafterl
+
 #endif