diff --git a/3rdparty/hts_engine_API/lib/HTS_misc.c b/3rdparty/hts_engine_API/lib/HTS_misc.c
index b0d112d32..290ef16e1 100644
--- a/3rdparty/hts_engine_API/lib/HTS_misc.c
+++ b/3rdparty/hts_engine_API/lib/HTS_misc.c
@@ -245,7 +245,7 @@ size_t HTS_ftell(HTS_File * fp)
    } else if (fp->type == HTS_FILE) {
       fpos_t pos;
       fgetpos((FILE *) fp->pointer, &pos);
-#if defined(_WIN32) || defined(__CYGWIN__) || defined(__APPLE__) || defined(__FreeBSD__) || defined(__ANDROID__)
+#if defined(_WIN32) || defined(__CYGWIN__) || defined(__APPLE__) || defined(__FreeBSD__) || defined(__ANDROID__) || defined(__OpenBSD__)
       return (size_t) pos;
 #else
       return (size_t) pos.__pos;
diff --git a/3rdparty/joystick/jsNone.cxx b/3rdparty/joystick/jsNone.cxx
index e5de5c2e0..f4f1d8c72 100644
--- a/3rdparty/joystick/jsNone.cxx
+++ b/3rdparty/joystick/jsNone.cxx
@@ -22,6 +22,10 @@
 
 #include "js.h"
 
+#ifdef __OpenBSD__
+  #define TRUE JS_TRUE
+#endif
+
 struct os_specific_s ;
 
 
diff --git a/CMakeLists.txt b/CMakeLists.txt
index f1fb2f1ed..dee83e92b 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -136,7 +136,8 @@ elseif(WIN32)
     MESSAGE("Installing: ${CMAKE_INSTALL_SYSTEM_RUNTIME_LIBS}")
 
 elseif(${CMAKE_SYSTEM_NAME} MATCHES "Linux" OR
-	${CMAKE_SYSTEM_NAME} MATCHES "FreeBSD")
+	${CMAKE_SYSTEM_NAME} MATCHES "FreeBSD" OR
+	${CMAKE_SYSTEM_NAME} MATCHES "OpenBSD")
     find_package(Threads REQUIRED)
     find_package(X11 REQUIRED)
 
@@ -233,6 +234,10 @@ if(SP_FDMS)
     set(ENABLE_SP_FDM 1)
 endif()
 
+if(${CMAKE_SYSTEM_NAME} MATCHES "OpenBSD")
+    include_directories(${PROJECT_SOURCE_DIR}/3rdparty/iaxclient/lib/libspeex/include)
+endif()
+
 if(ENABLE_FGCOM)
   set(ENABLE_IAX 1)
   include_directories(${PROJECT_SOURCE_DIR}/3rdparty/iaxclient/lib ) # for iaxclient.h
@@ -246,7 +251,7 @@ if(EVENT_INPUT)
       add_definitions(-DWITH_EVENTINPUT)
       find_library(IOKIT_FRAMEWORK IOKit)
       list(APPEND EVENT_INPUT_LIBRARIES ${IOKIT_FRAMEWORK})
-    elseif(CMAKE_SYSTEM_NAME MATCHES "Linux|FreeBSD")
+    elseif(CMAKE_SYSTEM_NAME MATCHES "Linux|FreeBSD|OpenBSD")
         if(NOT UDEV_FOUND)
             message(WARNING "UDev not found, event input is disabled!")
             set(EVENT_INPUT 0)
@@ -321,6 +326,10 @@ if (MSVC)
 	endif()
 endif()
 
+#if(${CMAKE_SYSTEM_NAME} MATCHES "OpenBSD")
+#    include_directories("${CMAKE_SOURCE_DIR}/3rdparty/iaxclient/lib/libspeex/include")
+#endif()
+
 ##############################################################################
 ## Sqlite3 setup
 
diff --git a/CMakeModules/SetupFGFSLibraries.cmake b/CMakeModules/SetupFGFSLibraries.cmake
index 0e7546855..f73df77dd 100644
--- a/CMakeModules/SetupFGFSLibraries.cmake
+++ b/CMakeModules/SetupFGFSLibraries.cmake
@@ -84,4 +84,8 @@ function(setup_fgfs_libraries target)
     if(${CMAKE_SYSTEM_NAME} MATCHES "FreeBSD")
         target_link_libraries(${target} execinfo)
     endif()
+
+    if(${CMAKE_SYSTEM_NAME} MATCHES "OpenBSD")
+        target_link_libraries(${target} execinfo)
+    endif()
 endfunction()
diff --git a/src/Main/bootstrap.cxx b/src/Main/bootstrap.cxx
index 99affbec2..09f3c7618 100644
--- a/src/Main/bootstrap.cxx
+++ b/src/Main/bootstrap.cxx
@@ -163,6 +163,7 @@ void segfault_handler(int signo) {
 
   fprintf(stderr, "Error: caught signal %d:\n", signo);
 
+  #ifndef __OpenBSD__
   size = backtrace(array, 128);
   if (size) {
     char** list = backtrace_symbols(array, size);
@@ -199,6 +200,7 @@ void segfault_handler(int signo) {
     free(fname);
     free(list);
   }
+  #endif
 
   std::abort();
 }
diff --git a/src/Main/main.cxx b/src/Main/main.cxx
index 5fd7feabd..c856b4c33 100644
--- a/src/Main/main.cxx
+++ b/src/Main/main.cxx
@@ -93,6 +93,10 @@ extern bool global_crashRptEnabled;
 #include <GUI/QtLauncher.hxx>
 #endif
 
+#ifdef __OpenBSD__
+#include <sys/resource.h>
+#endif
+
 using namespace flightgear;
 
 using std::cerr;
@@ -532,7 +536,7 @@ int fgMainInit( int argc, char **argv )
     // level once startup is done.
     sglog().setLogLevels( SG_ALL, SG_INFO );
     sglog().setStartupLoggingEnabled(true);
-
+    
     globals = new FGGlobals;
     if (!fgInitHome()) {
         return EXIT_FAILURE;
@@ -555,6 +559,29 @@ int fgMainInit( int argc, char **argv )
     SG_LOG(SG_GENERAL, SG_ALERT, "Minimum supported OpenScenegraph is V3.4.1 - currently using " << osgGetVersion() << " This can cause fatal OSG 'final reference count' errors at runtime");
 #endif
 
+#ifdef __OpenBSD__
+    {
+        /* OpenBSD defaults to a small maximum data segment, which can cause
+        flightgear to crash with SIGBUS, so output a warning if this is likely.
+        */
+        struct rlimit   rlimit;
+        int e = getrlimit(RLIMIT_DATA, &rlimit);
+        if (e) {
+            SG_LOG( SG_GENERAL, SG_INFO, "This is OpenBSD; getrlimit() failed: " << strerror(errno));
+        }
+        else {
+            long long   required = 4LL * (1LL<<30);
+            if (rlimit.rlim_cur < required) {
+                SG_LOG( SG_GENERAL, SG_POPUP, ""
+                        << "Max data segment (" << rlimit.rlim_cur << "bytes) too small.\n"
+                        << "This can cause Flightgear to crash due to SIGBUS.\n"
+                        << "E.g. increase with 'ulimit -d " << required/1024 << "'."
+                        );
+            }
+        }
+    }
+#endif
+
     // seed the random number generator
     sg_srandom_time();
 
diff --git a/src/Main/metar_main.cxx b/src/Main/metar_main.cxx
index dd84514a2..349a305ed 100644
--- a/src/Main/metar_main.cxx
+++ b/src/Main/metar_main.cxx
@@ -42,7 +42,7 @@ using namespace std;
 using namespace simgear;
 
 // text color
-#if defined(__linux__) || defined(__sun) || defined(__CYGWIN__) || defined( __FreeBSD__ ) || defined ( sgi )
+#if defined(__linux__) || defined(__sun) || defined(__CYGWIN__) || defined( __FreeBSD__ ) || defined( __OpenBSD__ ) || defined ( sgi )
 #	define R "\033[31;1m"		// red
 #	define G "\033[32;1m"		// green
 #	define Y "\033[33;1m"		// yellow