diff --git a/CMakeLists.txt b/CMakeLists.txt
index 77ae270d..3ce8dad3 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -33,19 +33,9 @@ if(WIN32 OR CMAKE_SYSTEM_NAME STREQUAL "Windows")
     option(WIN9X "Enable support for Windows 95/98/ME." OFF)
     option(DSOUND "Enable DirectSound audio. (deprecated)" OFF)
     option(DDRAW "Enable DirectDraw video backend. (deprecated)" OFF)
-    option(SDL1 "Enable SDL1 video backend." OFF)
-    option(SDL2 "Enable SDL2 video backend." ON)
-    option(OPENAL "Enable OpenAL audio backend." ON)
     add_feature_info(Windows9x WIN9X "Windows 95/98/ME support" OFF)
     add_feature_info(DirectSound DSOUND "DirectSound audio backend (deprecated)")
     add_feature_info(DirectDraw DDRAW "DirectDraw video backend (deprecated)")
-    add_feature_info(SDL1 SDL1 "SDL1 video backend")
-    add_feature_info(SDL2 SDL2 "SDL2 video backend")
-    add_feature_info(OpenAL OPENAL "OpenAL audio backend")
-else()
-    add_feature_info(SDL1 SDL1 "SDL1 video backend")
-    add_feature_info(SDL2 SDL2 "SDL2 video backend")
-    set(OPENAL TRUE)
 endif()
 
 if(APPLE OR ${CMAKE_SYSTEM_NAME} MATCHES "Darwin")
@@ -56,6 +46,9 @@ if(APPLE OR ${CMAKE_SYSTEM_NAME} MATCHES "Darwin")
     endif()
 endif()
 
+add_feature_info(SDL1 SDL1 "SDL1 video backend")
+add_feature_info(SDL2 SDL2 "SDL2 video backend")
+add_feature_info(OpenAL OPENAL "OpenAL audio backend")
 add_feature_info(RemasterTD BUILD_REMASTERTD, "Remastered Tiberian Dawn dll")
 add_feature_info(RemasterRA BUILD_REMASTERRA "Remastered Red Alert dll")
 add_feature_info(VanillaTD BUILD_VANILLATD "Tiberian Dawn executable")
diff --git a/common/base64.cpp b/common/base64.cpp
index e14f1e84..66947822 100644
--- a/common/base64.cpp
+++ b/common/base64.cpp
@@ -36,6 +36,7 @@
 
 #include "base64.h"
 #include <stddef.h>
+#include "endianness.h"
 
 /*
 **	This is the magic padding character used to fill out the encoded data to a multiple of
@@ -425,4 +426,4 @@ implementations.
     within base64-encoded parts of multipart entities because no hyphen
     characters are used in the base64 encoding.
 
-*/
\ No newline at end of file
+*/
diff --git a/common/mp.cpp b/common/mp.cpp
index fdeef76a..e064cb23 100644
--- a/common/mp.cpp
+++ b/common/mp.cpp
@@ -265,6 +265,8 @@ void XMP_DER_Decode(digit* result, unsigned char const* input, int precision)
     }
 }
 
+#ifndef __BIG_ENDIAN__
+// FIXME: does not for work big-endian
 /***********************************************************************************************
  * XMP_Encode -- Encode MP number into buffer.                                                 *
  *                                                                                             *
@@ -308,6 +310,7 @@ unsigned XMP_Encode(unsigned char* to, unsigned tobytes, digit const* from, int
 
     return (tobytes);
 }
+#endif
 
 /***********************************************************************************************
  * XMP_Encode -- Encode MP number into buffer as compactly as possible.                        *
@@ -358,7 +361,8 @@ unsigned XMP_Encode(unsigned char* to, digit const* from, int precision)
     unsigned char* number_ptr;
 
     unsigned char* const end = (unsigned char*)from;
-    for (number_ptr = (unsigned char*)end + precision - 1; number_ptr > (unsigned char*)end; number_ptr--) {
+    for (number_ptr = (unsigned char*)end + precision * sizeof(digit) - 1; number_ptr > (unsigned char*)end;
+         number_ptr--) {
         if (*number_ptr != filler)
             break;
     }
@@ -922,6 +926,8 @@ unsigned XMP_Count_Bits(const digit* number, int precision)
     return (total_bit_count);
 }
 
+#ifndef __BIG_ENDIAN__
+// FIXME: does not work for big-endian
 /***********************************************************************************************
  * XMP_Count_Bytes -- Counts the number of precision bytes in MP number.                       *
  *                                                                                             *
@@ -951,6 +957,7 @@ int XMP_Count_Bytes(const digit* number, int precision)
     }
     return (count);
 }
+#endif
 
 /***********************************************************************************************
  * XMP_Move -- Assign one MP number to another.                                                *