diff -Naur gnuradio-3.7.13.2.orig/CMakeLists.txt gnuradio-3.7.13.2/CMakeLists.txt
--- gnuradio-3.7.13.2.orig/CMakeLists.txt	2018-06-13 21:38:34.000000000 +0200
+++ gnuradio-3.7.13.2/CMakeLists.txt	2020-05-17 10:45:46.012538000 +0200
@@ -186,6 +186,12 @@
 ########################################################################
 include(GrMiscUtils) #compiler flag check
 
+include(TestBigEndian)
+TEST_BIG_ENDIAN(GR_IS_BIG_ENDIAN)
+if(GR_IS_BIG_ENDIAN)
+    add_definitions(-DGR_IS_BIG_ENDIAN)
+endif(GR_IS_BIG_ENDIAN)
+
 if(CMAKE_COMPILER_IS_GNUCXX AND NOT WIN32)
     #http://gcc.gnu.org/wiki/Visibility
     GR_ADD_CXX_COMPILER_FLAG_IF_AVAILABLE(-fvisibility=hidden HAVE_VISIBILITY_HIDDEN)
diff -Naur gnuradio-3.7.13.2.orig/gr-blocks/lib/wavfile.cc gnuradio-3.7.13.2/gr-blocks/lib/wavfile.cc
--- gnuradio-3.7.13.2.orig/gr-blocks/lib/wavfile.cc	2018-06-13 21:38:34.000000000 +0200
+++ gnuradio-3.7.13.2/gr-blocks/lib/wavfile.cc	2020-05-17 10:47:30.216538000 +0200
@@ -27,7 +27,6 @@
 #include <gnuradio/blocks/wavfile.h>
 #include <cstring>
 #include <stdint.h>
-#include <boost/detail/endian.hpp> //BOOST_BIG_ENDIAN
 
 namespace gr {
   namespace blocks {
@@ -35,7 +34,7 @@
 
     // Basically, this is the opposite of htonx() and ntohx()
     // Define host to/from worknet (little endian) short and long
-#ifdef BOOST_BIG_ENDIAN
+#ifdef GR_IS_BIG_ENDIAN
 
     static inline uint16_t __gri_wav_bs16(uint16_t x)
     {
@@ -59,7 +58,7 @@
     #define htows(x) uint16_t(x)
     #define wtohs(x) uint16_t(x)
 
-#endif // BOOST_BIG_ENDIAN
+#endif // GR_IS_BIG_ENDIAN
 
     // WAV files are always little-endian, so we need some byte switching macros
     static inline uint32_t host_to_wav(uint32_t x) { return htowl(x); }