diff --git a/libs/fst/wscript b/libs/fst/wscript
index 4a1e4908f7..7242024b2e 100644
--- a/libs/fst/wscript
+++ b/libs/fst/wscript
@@ -86,7 +86,7 @@ def build(bld):
         'PACKAGE="' + I18N_PACKAGE + str(bld.env['MAJOR']) + '"',
         'LIBARDOUR="' + bld.env['lwrcase_dirname'] + '"',
         ]
-    if re.search ("freebsd", sys.platform) != None or re.search ("openbsd", sys.platform) != None:
+    if re.search ("bsd", sys.platform) != None:
         obj.defines.append('_POSIX_C_SOURCE=200809')
         obj.defines.append('_XOPEN_SOURCE=700')
 
diff --git a/tools/gccabicheck/wscript b/tools/gccabicheck/wscript
index afdb99f506..1b89cf57dd 100644
--- a/tools/gccabicheck/wscript
+++ b/tools/gccabicheck/wscript
@@ -21,6 +21,6 @@ def build(bld):
     obj.source = [ 'abicheck.c' ]
     obj.target = 'gcc-glibmm-abi-check'
     obj.name = 'gcc-glibmm-abi-check'
-    if re.search ("freebsd", sys.platform) == None:
+    if re.search ("bsd", sys.platform) == None:
         obj.lib = 'dl'
     obj.install_path = None
diff --git a/wscript b/wscript
index 14540cdedf..8270411ae5 100644
--- a/wscript
+++ b/wscript
@@ -656,7 +656,7 @@ int main() { return 0; }''',
     if opt.stl_debug:
         cxx_flags.append("-D_GLIBCXX_DEBUG")
 
-    if re.search ("freebsd", sys.platform) != None or re.search ("openbsd", sys.platform) != None:
+    if re.search ("bsd", sys.platform) != None:
         linker_flags.append('-lexecinfo')
 
     if conf.env['DEBUG_RT_ALLOC']:
@@ -1059,7 +1059,7 @@ def configure(conf):
 
     # executing a test program is n/a when cross-compiling
     if Options.options.dist_target != 'mingw':
-        if Options.options.dist_target != 'msvc' and re.search ("openbsd", sys.platform) == None:
+        if Options.options.dist_target != 'msvc' and re.search ("(open|net)bsd", sys.platform) == None:
             if re.search ("freebsd", sys.platform) != None:
                 conf.check_cc(
                         msg="Checking for function 'dlopen' in dlfcn.h",