diff --git a/SConstruct b/SConstruct
index a509cefc..af48e599 100644
--- a/SConstruct
+++ b/SConstruct
@@ -285,8 +285,8 @@ if sys.platform == 'darwin':
 	coreEnv_osx['CXXFLAGS'].append('-fno-strict-aliasing');
 	libcore_objects += coreEnv_osx.SharedObject('src/libcore/platform_darwin.mm')
 elif sys.platform == 'win32':
-	libcore_objects += coreEnv_osx.SharedObject('src/libcore/getopt.c')
-	libcore_objects += coreEnv_osx.SharedObject('src/libcore/platform_win32.cpp')
+	libcore_objects += coreEnv.SharedObject('src/libcore/getopt.c')
+	libcore_objects += coreEnv.SharedObject('src/libcore/platform_win32.cpp')
 
 libcore = coreEnv.SharedLibrary('src/libcore/mitsuba-core', libcore_objects);
 
diff --git a/include/mitsuba/core/atomic.h b/include/mitsuba/core/atomic.h
index 8d646b8c..4af4d365 100644
--- a/include/mitsuba/core/atomic.h
+++ b/include/mitsuba/core/atomic.h
@@ -29,7 +29,8 @@ MTS_NAMESPACE_BEGIN
 
 template <typename T> inline bool atomicCompareAndExchangePtr(T **v, T *newValue, T *oldValue) {
 #if defined(WIN32)
-    return InterlockedCompareExchange(v, newValue, oldValue) == oldValue;
+    return InterlockedCompareExchangePointer(
+		reinterpret_cast<volatile PVOID *>(v), newValue, oldValue) == oldValue;
 #else
 	return __sync_bool_compare_and_swap(v, oldValue, newValue);
 #endif
diff --git a/include/mitsuba/core/getopt.h b/include/mitsuba/core/getopt.h
index ced5d056..8c5a6598 100644
--- a/include/mitsuba/core/getopt.h
+++ b/include/mitsuba/core/getopt.h
@@ -23,6 +23,14 @@
 # define _GETOPT_H 1
 #endif
 
+#if !defined(MTS_EXPORT_CORE)
+	#if MTS_BUILD_MODULE == MTS_MODULE_CORE
+		#define MTS_EXPORT_CORE __declspec(dllexport)
+	#else
+		#define MTS_EXPORT_CORE __declspec(dllimport)
+	#endif
+#endif
+
 #ifdef	__cplusplus
 extern "C" {
 #endif
@@ -33,7 +41,7 @@ extern "C" {
    Also, when `ordering' is RETURN_IN_ORDER,
    each non-option ARGV-element is returned here.  */
 
-extern char *optarg;
+extern MTS_EXPORT_CORE char *optarg;
 
 /* Index in ARGV of the next element to be scanned.
    This is used for communication to and from the caller
@@ -47,16 +55,16 @@ extern char *optarg;
    Otherwise, `optind' communicates from one call to the next
    how much of ARGV has been scanned so far.  */
 
-extern int optind;
+extern MTS_EXPORT_CORE int optind;
 
 /* Callers store zero here to inhibit the error message `getopt' prints
    for unrecognized options.  */
 
-extern int opterr;
+extern MTS_EXPORT_CORE int opterr;
 
 /* Set to an option character which was unrecognized.  */
 
-extern int optopt;
+extern MTS_EXPORT_CORE int optopt;
 
 #ifndef __need_getopt
 /* Describe the long-named options requested by the application.
@@ -125,17 +133,17 @@ struct option
 /* Many other libraries have conflicting prototypes for getopt, with
    differences in the consts, in stdlib.h.  To avoid compilation
    errors, only prototype getopt for the GNU C library.  */
-extern int getopt (int __argc, char *const *__argv, const char *__shortopts);
+extern MTS_EXPORT_CORE int getopt (int __argc, char *const *__argv, const char *__shortopts);
 
 # ifndef __need_getopt
-extern int getopt_long (int __argc, char *const *__argv, const char *__shortopts,
+extern MTS_EXPORT_CORE int getopt_long (int __argc, char *const *__argv, const char *__shortopts,
 		        const struct option *__longopts, int *__longind);
-extern int getopt_long_only (int __argc, char *const *__argv,
+extern MTS_EXPORT_CORE int getopt_long_only (int __argc, char *const *__argv,
 			     const char *__shortopts,
 		             const struct option *__longopts, int *__longind);
 
 /* Internal only.  Users should not call this directly.  */
-extern int _getopt_internal (int __argc, char *const *__argv,
+extern MTS_EXPORT_CORE int _getopt_internal (int __argc, char *const *__argv,
 			     const char *__shortopts,
 		             const struct option *__longopts, int *__longind,
 			     int __long_only);
diff --git a/include/mitsuba/core/stl.h b/include/mitsuba/core/stl.h
index 39e2a574..c0335feb 100644
--- a/include/mitsuba/core/stl.h
+++ b/include/mitsuba/core/stl.h
@@ -168,8 +168,10 @@ inline bool ubi_isnan(double f) {
 	int classification = ::_fpclass(f);
 	return classification == _FPCLASS_QNAN || classification == _FPCLASS_SNAN;
 }
+extern "C" {
+	extern MTS_EXPORT_CORE float nextafterf(float x, float y);
+};
 
-extern float nextafterf(float x, float y);
 #else
 inline bool ubi_isnan(float f) {
 	return std::fpclassify(f) == FP_NAN;
diff --git a/include/mitsuba/render/gkdtree.h b/include/mitsuba/render/gkdtree.h
index 01fe8e94..59a00cd2 100644
--- a/include/mitsuba/render/gkdtree.h
+++ b/include/mitsuba/render/gkdtree.h
@@ -119,7 +119,7 @@ public:
 	 * Walks through the list of chunks to find one with enough
 	 * free memory. If no chunk could be found, a new one is created.
 	 */
-	template <typename T> T * __restrict__ allocate(size_t size) {
+	template <typename T> T * __restrict allocate(size_t size) {
 		size *= sizeof(T);
 		for (std::vector<Chunk>::iterator it = m_chunks.begin();
 				it != m_chunks.end(); ++it) {
@@ -295,7 +295,7 @@ public:
 	 * create unused elements in the previous block if a new
 	 * one has to be allocated.
 	 */
-	inline T * __restrict__ allocate(size_t size) {
+	inline T * __restrict allocate(size_t size) {
 #if defined(MTS_KD_DEBUG)
 		SAssert(size <= BlockSize);
 #endif
@@ -2174,10 +2174,10 @@ protected:
 				}
 			}
 
-			KDAssert(leftEventsTempEnd - leftEventsTempStart <= primsLeft * 6);
-			KDAssert(rightEventsTempEnd - rightEventsTempStart <= primsRight * 6);
-			KDAssert(newEventsLeftEnd - newEventsLeftStart <= primsBoth * 6);
-			KDAssert(newEventsRightEnd - newEventsRightStart <= primsBoth * 6);
+			KDAssert((size_type) (leftEventsTempEnd - leftEventsTempStart) <= primsLeft * 6);
+			KDAssert((size_type) (rightEventsTempEnd - rightEventsTempStart) <= primsRight * 6);
+			KDAssert((size_type) (newEventsLeftEnd - newEventsLeftStart) <= primsBoth * 6);
+			KDAssert((size_type) (newEventsRightEnd - newEventsRightStart) <= primsBoth * 6);
 			ctx.pruned += prunedLeft + prunedRight;
 
 			/* Sort the events from overlapping prims */
@@ -2216,8 +2216,8 @@ protected:
 					*rightEventsEnd++ = *event;
 				}
 			}
-			KDAssert(leftEventsEnd - leftEventsStart <= bestSplit.numLeft * 6);
-			KDAssert(rightEventsEnd - rightEventsStart <= bestSplit.numRight * 6);
+			KDAssert((size_type) (leftEventsEnd - leftEventsStart) <= bestSplit.numLeft * 6);
+			KDAssert((size_type) (rightEventsEnd - rightEventsStart) <= bestSplit.numRight * 6);
 		}
 
 		/* Shrink the edge event storage now that we know exactly how 
@@ -2317,7 +2317,7 @@ protected:
 		 */
 		void setAABB(const AABB &aabb) {
 			m_aabb = aabb;
-			m_binSize = m_aabb.getExtents() / m_binCount;
+			m_binSize = m_aabb.getExtents() / (Float) m_binCount;
 			for (int axis=0; axis<3; ++axis) 
 				m_invBinSize[axis] = 1/m_binSize[axis];
 		}
@@ -3092,9 +3092,9 @@ template <typename Derived> void GenericKDTree<Derived>::findCosts(
 					nIntersections++;
 				if (i > warmup) {
 					A[idx].x = 1;
-					A[idx].y = boost::get<1>(statistics);
-					A[idx].z = boost::get<2>(statistics);
-					b[idx]   = boost::get<3>(statistics);
+					A[idx].y = (Float) boost::get<1>(statistics);
+					A[idx].z = (Float) boost::get<2>(statistics);
+					b[idx]   = (Float) boost::get<3>(statistics);
 					idx++;
 				}
 			}
diff --git a/include/mitsuba/render/irrcache.h b/include/mitsuba/render/irrcache.h
index e27bf917..c9b2feee 100644
--- a/include/mitsuba/render/irrcache.h
+++ b/include/mitsuba/render/irrcache.h
@@ -39,7 +39,7 @@ typedef Spectrum TranslationalGradient[3];
  *
  * @author Wenzel Jakob
  */
-struct MTS_EXPORT_RENDER HemisphereSampler : public Object {
+class MTS_EXPORT_RENDER HemisphereSampler : public Object {
 public:
 	struct SampleEntry {
 		Vector d;
diff --git a/include/mitsuba/render/kdtree.h b/include/mitsuba/render/kdtree.h
index 79dab483..065183a5 100644
--- a/include/mitsuba/render/kdtree.h
+++ b/include/mitsuba/render/kdtree.h
@@ -54,7 +54,7 @@ MTS_NAMESPACE_BEGIN
  *
  * \sa GenericKDTree
  */
-class KDTree : public GenericKDTree<KDTree> {
+class MTS_EXPORT_RENDER KDTree : public GenericKDTree<KDTree> {
 	friend class GenericKDTree<KDTree>;
 public:
 	/// Create an empty kd-tree
diff --git a/src/converter/mtsimport.cpp b/src/converter/mtsimport.cpp
index 8d3838e4..f23d9b8f 100644
--- a/src/converter/mtsimport.cpp
+++ b/src/converter/mtsimport.cpp
@@ -32,7 +32,7 @@
 #include <mitsuba/core/plugin.h>
 #include <mitsuba/core/statistics.h>
 #if defined(WIN32)
-#include "../mitsuba/getopt.h"
+#include <mitsuba/core/getopt.h>
 #endif
 
 XERCES_CPP_NAMESPACE_USE
diff --git a/src/libcore/getopt.c b/src/libcore/getopt.c
index 79ccd96c..cc64bdad 100644
--- a/src/libcore/getopt.c
+++ b/src/libcore/getopt.c
@@ -100,7 +100,7 @@
    GNU application programs can use a third alternative mode in which
    they can distinguish the relative order of options and other arguments.  */
 
-#include "getopt.h"
+#include <mitsuba/core/getopt.h>
 
 /* For communication from `getopt' to the caller.
    When `getopt' finds an option that takes an argument,
diff --git a/src/librender/integrator.cpp b/src/librender/integrator.cpp
index 97ee849a..51776a42 100644
--- a/src/librender/integrator.cpp
+++ b/src/librender/integrator.cpp
@@ -163,7 +163,7 @@ void SampleIntegrator::renderBlock(const Scene *scene,
 	RadianceQueryRecord rRec(scene, sampler);
 	bool needsLensSample = camera->needsLensSample();
 	const TabulatedFilter *filter = camera->getFilm()->getTabulatedFilter();
-	Float scaleFactor = 1.0f/std::sqrt(sampler->getSampleCount());
+	Float scaleFactor = 1.0f/std::sqrt((Float) sampler->getSampleCount());
 
 	if (!block->collectStatistics()) {
 		for (y = sy; y < ey; y++) {