diff --git a/bison.pri b/bison.pri
index f28c6e04..bc40dd8f 100644
--- a/bison.pri
+++ b/bison.pri
@@ -3,7 +3,7 @@
   bison.input = BISONSOURCES
   bison.output = ${QMAKE_FILE_PATH}/${QMAKE_FILE_BASE}_yacc.cpp
   bison.commands = bison -d -p ${QMAKE_FILE_BASE} -o ${QMAKE_FILE_PATH}/${QMAKE_FILE_BASE}_yacc.cpp ${QMAKE_FILE_IN}
-  bison.commands += && if [ -e ${QMAKE_FILE_PATH}/${QMAKE_FILE_BASE}_yacc.hpp ]; then mv ${QMAKE_FILE_PATH}/${QMAKE_FILE_BASE}_yacc.hpp ${QMAKE_FILE_PATH}/${QMAKE_FILE_BASE}_yacc.h ; fi
+#  bison.commands += && if [[ -e ${QMAKE_FILE_PATH}/${QMAKE_FILE_BASE}_yacc.hpp ]] ; then mv ${QMAKE_FILE_PATH}/${QMAKE_FILE_BASE}_yacc.hpp ${QMAKE_FILE_PATH}/${QMAKE_FILE_BASE}_yacc.h ; fi
   bison.CONFIG += target_predeps
   bison.variable_out = GENERATED_SOURCES
   silent:bison.commands = @echo Bison ${QMAKE_FILE_IN} && $$bison.commands
@@ -11,7 +11,7 @@
   bison_header.input = BISONSOURCES
   bison_header.output = ${QMAKE_FILE_PATH}/${QMAKE_FILE_BASE}_yacc.h
   bison_header.commands = bison -d -p ${QMAKE_FILE_BASE} -o ${QMAKE_FILE_PATH}/${QMAKE_FILE_BASE}_yacc.cpp ${QMAKE_FILE_IN}
-  bison_header.commands += && if [ -e ${QMAKE_FILE_PATH}/${QMAKE_FILE_BASE}_yacc.hpp ]; then mv ${QMAKE_FILE_PATH}/${QMAKE_FILE_BASE}_yacc.hpp ${QMAKE_FILE_PATH}/${QMAKE_FILE_BASE}_yacc.h ; fi
+#  bison_header.commands += && if [ -e ${QMAKE_FILE_PATH}/${QMAKE_FILE_BASE}_yacc.hpp ]; then mv ${QMAKE_FILE_PATH}/${QMAKE_FILE_BASE}_yacc.hpp ${QMAKE_FILE_PATH}/${QMAKE_FILE_BASE}_yacc.h ; fi
   bison_header.CONFIG += target_predeps no_link
   silent:bison_header.commands = @echo Bison ${QMAKE_FILE_IN} && $$bison.commands
   QMAKE_EXTRA_COMPILERS += bison_header
@@ -40,3 +40,6 @@ netbsd* {
     QMAKE_YACC = bison
   }
 }
+
+win32*msvc* {
+}
diff --git a/cgal.pri b/cgal.pri
index 241332a5..e61b6def 100644
--- a/cgal.pri
+++ b/cgal.pri
@@ -19,7 +19,7 @@ cgal {
       *-g++* { 
         QMAKE_CXXFLAGS += -frounding-math 
       }
-      LIBS += $$CGAL_DIR/auxiliary/gmp/lib/libmpfr-4.lib -lCGAL-vc90-mt-s
+      LIBS += $$CGAL_DIR/auxiliary/gmp/lib/libmpfr-4.lib -lCGAL-vc110-mt-gd
     } else {
       LIBS += -lgmp -lmpfr -lCGAL
       QMAKE_CXXFLAGS += -frounding-math 
diff --git a/src/GLView.cc b/src/GLView.cc
index b4fb8d6f..822a2462 100644
--- a/src/GLView.cc
+++ b/src/GLView.cc
@@ -2,6 +2,7 @@
 
 #include "stdio.h"
 #include "rendersettings.h"
+#include "mathc99.h"
 
 #ifdef _WIN32
 #include <GL/wglew.h>
diff --git a/src/OpenCSGRenderer.cc b/src/OpenCSGRenderer.cc
index b4acf824..e65a2595 100644
--- a/src/OpenCSGRenderer.cc
+++ b/src/OpenCSGRenderer.cc
@@ -77,8 +77,8 @@ void OpenCSGRenderer::renderCSGChain(CSGChain *chain, GLint *shaderinfo,
 	std::vector<OpenCSG::Primitive*> primitives;
 	size_t j = 0;
 	for (size_t i = 0;; i++) {
-		const CSGChainObject &i_obj = chain->objects[i];
 		bool last = i == chain->objects.size();
+		const CSGChainObject &i_obj = last ? chain->objects[i-1] : chain->objects[i];
 		if (last || i_obj.type == CSGTerm::TYPE_UNION) {
 			if (j+1 != i) {
 				 OpenCSG::render(primitives);
diff --git a/src/control.cc b/src/control.cc
index c5ad09b3..50e5eaec 100644
--- a/src/control.cc
+++ b/src/control.cc
@@ -31,6 +31,7 @@
 #include "builtin.h"
 #include "printutils.h"
 #include <sstream>
+#include "mathc99.h"
 
 enum control_type_e {
 	CHILD,
diff --git a/src/import.cc b/src/import.cc
index b5d67d27..38973312 100644
--- a/src/import.cc
+++ b/src/import.cc
@@ -212,7 +212,9 @@ PolySet *ImportNode::evaluate_polyset(class PolySetEvaluator *) const
 #ifdef BOOST_BIG_ENDIAN
 			uint32_byte_swap( facenum );
 #endif
-			if (file_size == 80 + 4 + 50*facenum) binary = true;
+			if (file_size ==  static_cast<std::streamoff>(80 + 4 + 50*facenum)) {
+				binary = true;
+			}
 		}
 		f.seekg(0);
 
diff --git a/src/lexer.l b/src/lexer.l
index 3dd3b6bf..e08c6c7f 100644
--- a/src/lexer.l
+++ b/src/lexer.l
@@ -30,7 +30,7 @@
 #include "handle_dep.h"
 #include "printutils.h"
 #include "parsersettings.h"
-#include "parser_yacc.h"
+#include "parser_yacc.hpp"
 #include "module.h"
 #include <assert.h>
 #include <boost/foreach.hpp>
diff --git a/src/mathc99.cc b/src/mathc99.cc
index 335446e5..13f4c64a 100644
--- a/src/mathc99.cc
+++ b/src/mathc99.cc
@@ -3,8 +3,12 @@
 #ifdef WIN32
 #include <algorithm>
 
+double trunc(double a) {
+	return (a >= 0) ? floor(a) : ceil(a);
+}
+
 double round(double a) {
-	return a > 0 ? floor(a+0.5) : ceil(a-0.5);
+	return a < 0 ? ceil(a - 0.5f) : floor(a + 0.5f);
 }
 
 float fmin(float a, float b) {
diff --git a/src/mathc99.h b/src/mathc99.h
index ebc2d661..ae31a227 100644
--- a/src/mathc99.h
+++ b/src/mathc99.h
@@ -5,6 +5,7 @@
 
 #include <cmath>
 //for native win32 builds we need to provide C99 math functions by ourselves
+double trunc(double a);
 double round(double a);
 float fmin(float a, float b);
 float fmax(float a, float b);
diff --git a/win.pri b/win.pri
index bb41b094..b5db5157 100644
--- a/win.pri
+++ b/win.pri
@@ -5,7 +5,8 @@ win32*msvc* {
   INCLUDEPATH += $$(MPIRDIR)
   INCLUDEPATH += $$(MPFRDIR)
 
-  DEFINES += _USE_MATH_DEFINES NOMINMAX _CRT_SECURE_NO_WARNINGS YY_NO_UNISTD_H
+  # don't know where the __WIN32__ is usually set
+  DEFINES += _USE_MATH_DEFINES NOMINMAX _CRT_SECURE_NO_WARNINGS YY_NO_UNISTD_H __WIN32__
 
   # disable MSVC warnings that are of very low importance
   # disable warning about too long decorated names
@@ -16,5 +17,9 @@ win32*msvc* {
   QMAKE_CXXFLAGS += -wd4100
   # lexer uses strdup() & other POSIX stuff
   QMAKE_CXXFLAGS += -D_CRT_NONSTDC_NO_DEPRECATE
+  # Treat WChar_t as a builtin type, allows Qt to call boost funcions
+  QMAKE_CXXFLAGS += /Zc:wchar_t
+  # increases the number of sections in .obj file
+  QMAKE_CXXFLAGS += /bigobj
 
 }