diff --git a/CMakeLists.txt b/CMakeLists.txt
index b6e81fd..03f5a31 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -21,6 +21,11 @@ link_directories(${OGG_LIBRARY_DIRS})
 
 include(FindIconv)
 
+# We need endian.h on Linux, and sys/endian.h on BSD.
+include(CheckIncludeFileCXX)
+check_include_file_cxx(endian.h HAVE_ENDIAN_H)
+check_include_file_cxx(sys/endian.h HAVE_SYS_ENDIAN_H)
+
 configure_file(src/config.h.in config.h @ONLY)
 include_directories(BEFORE src "${CMAKE_BINARY_DIR}" ${OGG_INCLUDE_DIRS} ${Iconv_INCLUDE_DIRS})
 
diff --git a/src/config.h.in b/src/config.h.in
index a447c65..7699db8 100644
--- a/src/config.h.in
+++ b/src/config.h.in
@@ -1,2 +1,5 @@
 #cmakedefine PROJECT_NAME "@PROJECT_NAME@"
 #cmakedefine PROJECT_VERSION "@PROJECT_VERSION@"
+
+#cmakedefine HAVE_ENDIAN_H @HAVE_ENDIAN_H@
+#cmakedefine HAVE_SYS_ENDIAN_H @HAVE_SYS_ENDIAN_H@
diff --git a/src/opus.cc b/src/opus.cc
index 34dd6d3..ed8e49b 100644
--- a/src/opus.cc
+++ b/src/opus.cc
@@ -25,6 +25,14 @@
 
 #include <string.h>
 
+#ifdef HAVE_ENDIAN_H
+#  include <endian.h>
+#endif
+
+#ifdef HAVE_SYS_ENDIAN_H
+#  include <sys/endian.h>
+#endif
+
 #ifdef __APPLE__
 #include <libkern/OSByteOrder.h>
 #define htole32(x) OSSwapHostToLittleInt32(x)