diff --git a/builds/posix/prefix.mingw b/builds/posix/prefix.mingw
index 33ba53110f..b2d434bd7c 100644
--- a/builds/posix/prefix.mingw
+++ b/builds/posix/prefix.mingw
@@ -20,8 +20,8 @@
 # 
 
 # -Wno-unused-variable is used due to unused gpre generated variables
-PROD_FLAGS=-O2  -march=i586 -DMINGW -mno-cygwin -Wall -Wshadow -Wundef -Wno-long-long -Wno-unused-variable -Wno-sign-compare -Wno-parentheses -Wno-switch -fmessage-length=0 -Dlint -DWIN32_LEAN_AND_MEAN -MMD -mthreads -Wno-non-virtual-dtor
-DEV_FLAGS=-ggdb -march=i586 -DMINGW -mno-cygwin -Wall -Wshadow -Wundef -Wno-long-long -Wno-unused-variable -Wno-sign-compare -Wno-parentheses -Wno-switch -fmessage-length=0 -Dlint -DWIN32_LEAN_AND_MEAN -MMD -mthreads -Wno-non-virtual-dtor
+PROD_FLAGS=-O2  -march=i586 -DMINGW -Wall -Wshadow -Wundef -Wno-long-long -Wno-unused-variable -Wno-sign-compare -Wno-parentheses -Wno-switch -fmessage-length=0 -Dlint -DWIN32_LEAN_AND_MEAN -MMD -mthreads -Wno-non-virtual-dtor
+DEV_FLAGS=-ggdb -march=i586 -DMINGW -Wall -Wshadow -Wundef -Wno-long-long -Wno-unused-variable -Wno-sign-compare -Wno-parentheses -Wno-switch -fmessage-length=0 -Dlint -DWIN32_LEAN_AND_MEAN -MMD -mthreads -Wno-non-virtual-dtor
 
 PLATFORM_PATH=os/win32
 
diff --git a/configure.ac b/configure.ac
index 97c4160791..41a0ad9fbf 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1037,7 +1037,7 @@ case "$PLATFORM" in
 #define FB_PIPE_NAME "interbas"])
     AC_DEFINE_UNQUOTED(FB_PIPE_NAME,"$FB_PIPE_NAME")
     AC_SUBST(FB_PIPE_NAME)
-    XE_PREPEND( -mno-cygwin -mthreads -lmpr -lversion -lws2_32 -lole32,LIBS)
+    XE_PREPEND( -mthreads -lmpr -lversion -lws2_32 -lole32,LIBS)
     ;;
 
   *)
diff --git a/extern/libtommath/makefile.cygwin_dll b/extern/libtommath/makefile.cygwin_dll
index 85a9b20533..2050a17839 100644
--- a/extern/libtommath/makefile.cygwin_dll
+++ b/extern/libtommath/makefile.cygwin_dll
@@ -5,7 +5,7 @@
 #"-Wl,--enable-auto-import" to your client build to avoid the auto-import warnings
 #
 #Tom St Denis
-CFLAGS  +=  -I./ -Wall -W -Wshadow -O3 -funroll-loops -mno-cygwin
+CFLAGS  +=  -I./ -Wall -W -Wshadow -O3 -funroll-loops
 
 #x86 optimizations [should be valid for any GCC install though]
 CFLAGS  += -fomit-frame-pointer 
@@ -42,7 +42,7 @@ bn_mp_to_signed_bin_n.o bn_mp_to_unsigned_bin_n.o
 
 # make a Windows DLL via Cygwin
 windll:  $(OBJECTS)
-	gcc -mno-cygwin -mdll -o libtommath.dll -Wl,--out-implib=libtommath.dll.a -Wl,--export-all-symbols *.o
+	gcc -mdll -o libtommath.dll -Wl,--out-implib=libtommath.dll.a -Wl,--export-all-symbols *.o
 	ranlib libtommath.dll.a
 
 # build the test program using the windows DLL