--- a/include/cmath
+++ b/include/cmath
@@ -615,7 +615,7 @@ _Fp __lerp(_Fp __a, _Fp __b, _Fp __t) no
 
     if (__t == 1) return __b;
     const _Fp __x = __a + __t * (__b - __a);
-    if (__t > 1 == __b > __a)
+    if ((__t > 1) == (__b > __a))
     	return __b < __x ? __x : __b;
     else
     	return __x < __b ? __x : __b;
--- a/include/memory
+++ b/include/memory
@@ -1696,7 +1696,7 @@ struct _LIBCPP_TEMPLATE_VIS allocator_tr
             ptrdiff_t _Np = __end1 - __begin1;
             __end2 -= _Np;
             if (_Np > 0)
-                _VSTD::memcpy(__end2, __begin1, _Np * sizeof(_Tp));
+                __end2 = __begin1;
         }
 
 private:
--- a/src/filesystem/filesystem_common.h
+++ b/src/filesystem/filesystem_common.h
@@ -197,8 +197,8 @@ private:
 using chrono::duration;
 using chrono::duration_cast;
 
-using TimeSpec = struct ::timespec;
-using StatT = struct ::stat;
+using TimeSpec = struct timespec;
+using StatT = struct stat;
 
 template <class FileTimeT, class TimeT,
           bool IsFloat = is_floating_point<typename FileTimeT::rep>::value>