diff --git a/passes/cmds/select.cc b/passes/cmds/select.cc
index 3a886b1c8..59f936b01 100644
--- a/passes/cmds/select.cc
+++ b/passes/cmds/select.cc
@@ -23,6 +23,7 @@
 #include "kernel/log.h"
 #include <string.h>
 #include <fnmatch.h>
+#include <errno.h>
 
 using RTLIL::id2cstr;
 
diff --git a/passes/fsm/fsm_recode.cc b/passes/fsm/fsm_recode.cc
index 5a4e091cf..b02287962 100644
--- a/passes/fsm/fsm_recode.cc
+++ b/passes/fsm/fsm_recode.cc
@@ -23,8 +23,9 @@
 #include "kernel/consteval.h"
 #include "kernel/celltypes.h"
 #include "fsmdata.h"
-#include "math.h"
+#include <math.h>
 #include <string.h>
+#include <errno.h>
 
 static void fm_set_fsm_print(RTLIL::Cell *cell, RTLIL::Module *module, FsmData &fsm_data, const char *prefix, FILE *f)
 {
diff --git a/passes/techmap/dfflibmap.cc b/passes/techmap/dfflibmap.cc
index fd5fa86e1..4bf73358b 100644
--- a/passes/techmap/dfflibmap.cc
+++ b/passes/techmap/dfflibmap.cc
@@ -21,6 +21,7 @@
 #include "kernel/log.h"
 #include "libparse.h"
 #include <string.h>
+#include <errno.h>
 
 using namespace PASS_DFFLIBMAP;