Index: pdfmod-0.9.1/lib/PdfSharp/Makefile.am
===================================================================
--- pdfmod-0.9.1.orig/lib/PdfSharp/Makefile.am
+++ pdfmod-0.9.1/lib/PdfSharp/Makefile.am
@@ -5,7 +5,7 @@ EXTRA_DIST =
 
 if ENABLE_DEBUG
 ASSEMBLY_COMPILER_COMMAND = $(MCS)
-ASSEMBLY_COMPILER_FLAGS =  -noconfig -codepage:utf8 -warn:4 -optimize+ -debug "-define:TRACE;GDI;UseGdiObjects"
+ASSEMBLY_COMPILER_FLAGS = -sdk:4 -noconfig -codepage:utf8 -warn:4 -optimize+ -debug "-define:TRACE;GDI;UseGdiObjects"
 ASSEMBLY = ../../bin/PdfSharp.dll
 ASSEMBLY_MDB = $(ASSEMBLY).mdb
 COMPILE_TARGET = library
@@ -18,7 +18,7 @@ endif
 
 if ENABLE_RELEASE
 ASSEMBLY_COMPILER_COMMAND = $(MCS)
-ASSEMBLY_COMPILER_FLAGS =  -noconfig -codepage:utf8 -warn:4 -optimize+ -debug "-define:TRACE;GDI;UseGdiObjects"
+ASSEMBLY_COMPILER_FLAGS = -sdk:4 -noconfig -codepage:utf8 -warn:4 -optimize+ -debug "-define:TRACE;GDI;UseGdiObjects"
 ASSEMBLY = ../../bin/PdfSharp.dll
 ASSEMBLY_MDB = $(ASSEMBLY).mdb
 COMPILE_TARGET = library
Index: pdfmod-0.9.1/lib/poppler-sharp/Makefile.am
===================================================================
--- pdfmod-0.9.1.orig/lib/poppler-sharp/Makefile.am
+++ pdfmod-0.9.1/lib/poppler-sharp/Makefile.am
@@ -4,7 +4,7 @@ EXTRA_DIST =
 if USE_BUNDLED_POPPLER
 if ENABLE_DEBUG
 ASSEMBLY_COMPILER_COMMAND = $(MCS)
-ASSEMBLY_COMPILER_FLAGS =  -noconfig -codepage:utf8 -warn:4 -optimize+ -unsafe -debug "-define:DEBUG"
+ASSEMBLY_COMPILER_FLAGS =  -sdk:4 -noconfig -codepage:utf8 -warn:4 -optimize+ -unsafe -debug "-define:DEBUG"
 ASSEMBLY = ../../bin/poppler-sharp.dll
 ASSEMBLY_MDB = $(ASSEMBLY).mdb
 COMPILE_TARGET = library
@@ -15,7 +15,7 @@ endif
 
 if ENABLE_RELEASE
 ASSEMBLY_COMPILER_COMMAND = $(MCS)
-ASSEMBLY_COMPILER_FLAGS =  -noconfig -codepage:utf8 -warn:4 -optimize+ -unsafe -debug -define:DEBUG
+ASSEMBLY_COMPILER_FLAGS =  -sdk:4 -noconfig -codepage:utf8 -warn:4 -optimize+ -unsafe -debug -define:DEBUG
 ASSEMBLY = ../../bin/poppler-sharp.dll
 ASSEMBLY_MDB = $(ASSEMBLY).mdb
 COMPILE_TARGET = library
Index: pdfmod-0.9.1/src/Makefile.am
===================================================================
--- pdfmod-0.9.1.orig/src/Makefile.am
+++ pdfmod-0.9.1/src/Makefile.am
@@ -4,7 +4,7 @@
 EXTRA_DIST =
 
 ASSEMBLY_COMPILER_COMMAND = $(MCS)
-ASSEMBLY_COMPILER_FLAGS =  -noconfig -codepage:utf8 -warn:4 -optimize+ -debug "-define:DEBUG"
+ASSEMBLY_COMPILER_FLAGS = -sdk:4 -noconfig -codepage:utf8 -warn:4 -optimize+ -debug "-define:DEBUG"
 ASSEMBLY = ../bin/PdfMod.exe
 ASSEMBLY_MDB = $(ASSEMBLY).mdb
 COMPILE_TARGET = exe
Index: pdfmod-0.9.1/lib/PdfSharp/Makefile.in
===================================================================
--- pdfmod-0.9.1.orig/lib/PdfSharp/Makefile.in
+++ pdfmod-0.9.1/lib/PdfSharp/Makefile.in
@@ -220,8 +220,8 @@ EXTRA_DIST = $(build_sources) $(build_re
 # Warning: This is an automatically generated file, do not edit!
 @ENABLE_DEBUG_TRUE@ASSEMBLY_COMPILER_COMMAND = $(MCS)
 @ENABLE_RELEASE_TRUE@ASSEMBLY_COMPILER_COMMAND = $(MCS)
-@ENABLE_DEBUG_TRUE@ASSEMBLY_COMPILER_FLAGS = -noconfig -codepage:utf8 -warn:4 -optimize+ -debug "-define:TRACE;GDI;UseGdiObjects"
-@ENABLE_RELEASE_TRUE@ASSEMBLY_COMPILER_FLAGS = -noconfig -codepage:utf8 -warn:4 -optimize+ -debug "-define:TRACE;GDI;UseGdiObjects"
+@ENABLE_DEBUG_TRUE@ASSEMBLY_COMPILER_FLAGS = -sdk:4 -noconfig -codepage:utf8 -warn:4 -optimize+ -debug "-define:TRACE;GDI;UseGdiObjects"
+@ENABLE_RELEASE_TRUE@ASSEMBLY_COMPILER_FLAGS = -sdk:4 -noconfig -codepage:utf8 -warn:4 -optimize+ -debug "-define:TRACE;GDI;UseGdiObjects"
 @ENABLE_DEBUG_TRUE@ASSEMBLY = ../../bin/PdfSharp.dll
 @ENABLE_RELEASE_TRUE@ASSEMBLY = ../../bin/PdfSharp.dll
 @ENABLE_DEBUG_TRUE@ASSEMBLY_MDB = $(ASSEMBLY).mdb
Index: pdfmod-0.9.1/lib/poppler-sharp/Makefile.in
===================================================================
--- pdfmod-0.9.1.orig/lib/poppler-sharp/Makefile.in
+++ pdfmod-0.9.1/lib/poppler-sharp/Makefile.in
@@ -218,8 +218,8 @@ EXTRA_DIST = $(build_sources) $(build_re
 	$(DATA_FILES) $(build_culture_res_files)
 @ENABLE_DEBUG_TRUE@@USE_BUNDLED_POPPLER_TRUE@ASSEMBLY_COMPILER_COMMAND = $(MCS)
 @ENABLE_RELEASE_TRUE@@USE_BUNDLED_POPPLER_TRUE@ASSEMBLY_COMPILER_COMMAND = $(MCS)
-@ENABLE_DEBUG_TRUE@@USE_BUNDLED_POPPLER_TRUE@ASSEMBLY_COMPILER_FLAGS = -noconfig -codepage:utf8 -warn:4 -optimize+ -unsafe -debug "-define:DEBUG"
-@ENABLE_RELEASE_TRUE@@USE_BUNDLED_POPPLER_TRUE@ASSEMBLY_COMPILER_FLAGS = -noconfig -codepage:utf8 -warn:4 -optimize+ -unsafe -debug -define:DEBUG
+@ENABLE_DEBUG_TRUE@@USE_BUNDLED_POPPLER_TRUE@ASSEMBLY_COMPILER_FLAGS = -sdk:4 -noconfig -codepage:utf8 -warn:4 -optimize+ -unsafe -debug "-define:DEBUG"
+@ENABLE_RELEASE_TRUE@@USE_BUNDLED_POPPLER_TRUE@ASSEMBLY_COMPILER_FLAGS = -sdk:4 -noconfig -codepage:utf8 -warn:4 -optimize+ -unsafe -debug -define:DEBUG
 @ENABLE_DEBUG_TRUE@@USE_BUNDLED_POPPLER_TRUE@ASSEMBLY = ../../bin/poppler-sharp.dll
 @ENABLE_RELEASE_TRUE@@USE_BUNDLED_POPPLER_TRUE@ASSEMBLY = ../../bin/poppler-sharp.dll
 @ENABLE_DEBUG_TRUE@@USE_BUNDLED_POPPLER_TRUE@ASSEMBLY_MDB = $(ASSEMBLY).mdb
Index: pdfmod-0.9.1/src/Makefile.in
===================================================================
--- pdfmod-0.9.1.orig/src/Makefile.in
+++ pdfmod-0.9.1/src/Makefile.in
@@ -223,7 +223,7 @@ EXTRA_DIST = $(build_sources) $(build_re
 	$(build_others_files) $(ASSEMBLY_WRAPPER_IN) $(EXTRAS) \
 	$(DATA_FILES) $(build_culture_res_files)
 ASSEMBLY_COMPILER_COMMAND = $(MCS)
-ASSEMBLY_COMPILER_FLAGS = -noconfig -codepage:utf8 -warn:4 -optimize+ -debug "-define:DEBUG"
+ASSEMBLY_COMPILER_FLAGS = -sdk:4 -noconfig -codepage:utf8 -warn:4 -optimize+ -debug "-define:DEBUG"
 ASSEMBLY = ../bin/PdfMod.exe
 ASSEMBLY_MDB = $(ASSEMBLY).mdb
 COMPILE_TARGET = exe