diff --git a/cpp/BoostParts/boost/python/detail/wrap_python.hpp b/cpp/BoostParts/boost/python/detail/wrap_python.hpp
index eaef7841..716511f8 100644
--- a/cpp/BoostParts/boost/python/detail/wrap_python.hpp
+++ b/cpp/BoostParts/boost/python/detail/wrap_python.hpp
@@ -82,7 +82,9 @@
 // Some things we need in order to get Python.h to work with compilers other
 // than MSVC on Win32
 //
-#if defined(_WIN32) || defined(__CYGWIN__)
+// only performing the check for defined(__CYGWIN__) on 32-bit systems
+// ensuring that SIZEOF_LONG is only altered on 32-bit CYGWIN systems
+#if defined(_WIN32)
 # if defined(__GNUC__) && defined(__CYGWIN__)
 
 #  define SIZEOF_LONG 4
diff --git a/install.sh b/install.sh
index c771e4a5..c3970ccf 100755
--- a/install.sh
+++ b/install.sh
@@ -41,6 +41,9 @@ function python_finder {
     lib_python="${python_prefix}/lib/lib${which_python}"
     if [ -f "${lib_python}.a" ]; then
       python_library+="${lib_python}.a"
+    elif [ -f "${lib_python}.dll.a" ]; then
+      ## added a check for .dll.a files for CYGWIN
+      python_library+="${lib_python}.dll.a"
     else
       python_library+="${lib_python}.dylib"
     fi