diff --git a/contrib/sdk/sources/libjpeg/Makefile b/contrib/sdk/sources/libjpeg/Makefile
index 9ade9ec9f4..c2106121da 100644
--- a/contrib/sdk/sources/libjpeg/Makefile
+++ b/contrib/sdk/sources/libjpeg/Makefile
@@ -9,11 +9,12 @@ AR = kos32-ar
 LD = kos32-ld
 STRIP = kos32-strip
 
-INSTALLDIR:= /home/autobuild/tools/win32/lib
+INSTALLDIR ?= /home/autobuild/tools/win32/lib
 
 CFLAGS = -UWIN32 -UWindows -U_WINDOWS -U_WIN32 -U__WIN32__ -c -O2 -fno-ident -fomit-frame-pointer
 
-LDFLAGS= -shared -s -T dll.lds --entry _DllStartup --image-base=0
+LDFLAGS = $(LDFLAGS_CMD)
+LDFLAGS+= -shared -s -T dll.lds --entry _DllStartup --image-base=0a
 LDFLAGS+=  --out-implib $(LIBRARY).dll.a
 
 ARFLAGS:= crs
diff --git a/contrib/sdk/sources/libpng/Makefile b/contrib/sdk/sources/libpng/Makefile
index 4783125911..ba722c1b41 100644
--- a/contrib/sdk/sources/libpng/Makefile
+++ b/contrib/sdk/sources/libpng/Makefile
@@ -5,11 +5,12 @@ AR = kos32-ar
 LD = kos32-ld
 STRIP = kos32-strip
 
-INSTALLDIR:= /home/autobuild/tools/win32/lib
+INSTALLDIR ?= /home/autobuild/tools/win32/lib
 
 CFLAGS = -UWIN32 -UWindows -U_WINDOWS -U_WIN32 -U__WIN32__ -c -O2 -fno-ident -fomit-frame-pointer
 
-LDFLAGS= -shared -s -T dll.lds --entry _DllStartup --image-base=0
+LDFLAGS=$(LDFLAGS_CMD)
+LDFLAGS+= -shared -s -T dll.lds --entry _DllStartup --image-base=0
 LDFLAGS+=  --out-implib $(LIBRARY).dll.a
  
 ARFLAGS:= crs