diff --git a/NEWS b/NEWS
--- a/NEWS
+++ b/NEWS
@@ -1,3 +1,12 @@
+Changes in 0.7.4:
+
+* Add C implementation of copysign, copysignf
+
+* Remove libm dependency
+
+* Anders Kaseorg fixed documentation for epsilon.
+
+
 Changes in 0.7.3:
 
 * Bugfix from Björn Buckwalter: any two negative values were aproxEqIEEE
diff --git a/Numeric/IEEE.hs b/Numeric/IEEE.hs
--- a/Numeric/IEEE.hs
+++ b/Numeric/IEEE.hs
@@ -33,7 +33,7 @@
     -- | The largest representable finite value.
     maxFinite :: a
 
-    -- | The smallest representalbe positive value @x@ such that @1 + x /= 1@.
+    -- | The smallest positive value @x@ such that @1 + x@ is representable.
     epsilon :: a
 
     -- | @copySign x y@ returns @x@ with its sign changed to @y@'s.
diff --git a/cbits/double.c b/cbits/double.c
--- a/cbits/double.c
+++ b/cbits/double.c
@@ -27,6 +27,18 @@
     return ux.w == uy.w;
 }
 
+double
+copysign (double x, double y)
+{
+    union double_t ux = { x };
+    union double_t uy = { y };
+    union double_t uz;
+    uint64_t val  = ux.w & 0x7FFFFFFFFFFFFFFFULL;
+    uint64_t sign = uy.w & 0x8000000000000000ULL;
+    uz.w = sign | val;
+    return uz.d;
+}
+
 /* ported from tango/math/IEEE.d */
 double
 nextup (double x)
diff --git a/cbits/float.c b/cbits/float.c
--- a/cbits/float.c
+++ b/cbits/float.c
@@ -28,6 +28,18 @@
     return ux.w == uy.w;
 }
 
+float
+copysignf (float x, float y)
+{
+    union float_t ux = { x };
+    union float_t uy = { y };
+    union float_t uz;
+    uint32_t val  = ux.w & 0x7FFFFFFF;
+    uint32_t sign = uy.w & 0x80000000;
+    uz.w = sign | val;
+    return uz.f;
+}
+
 /* ported from tango/math/IEEE.d */
 float
 nextupf (float x)
diff --git a/ieee754.cabal b/ieee754.cabal
--- a/ieee754.cabal
+++ b/ieee754.cabal
@@ -1,5 +1,5 @@
 name:            ieee754
-version:         0.7.3
+version:         0.7.4
 homepage:        http://github.com/patperry/hs-ieee754
 synopsis:        Utilities for dealing with IEEE floating point numbers
 description:
@@ -14,7 +14,7 @@
 maintainer:      Patrick Perry <patperry@gmail.com>
 cabal-version: >= 1.2.0
 build-type:      Simple
-tested-with:     GHC ==6.12.3
+tested-with:     GHC ==7.6.3
 
 extra-source-files: LICENSE.Tango NEWS cbits/feqrel_source.c
                     tests/Makefile tests/Tests.hs
@@ -41,5 +41,3 @@
     cc-options:      -Wall --std=c99
     if flag(big_endian)
         cc-options:  -DBIG_ENDIAN
-
-    extra-libraries: m