diff --git a/configure.ac b/configure.ac
index c7c2e13..09bc0f4 100644
--- a/configure.ac
+++ b/configure.ac
@@ -42,6 +42,8 @@ LIBBSD_LINKER_VERSION_SCRIPT
 
 is_windows=no
 
+api_time_macros=unknown
+
 abi_accmode=unknown
 abi_arc4random=unknown
 abi_arc4random_stir=unknown
@@ -86,6 +88,8 @@ abi_wcsl=unknown
 
 AS_CASE([$host_os],
   [*-gnu* | gnu*], [
+    api_time_macros=no
+
     abi_accmode=yes
     # DROP: On glibc >= 2.36.
     #abi_arc4random=no
@@ -145,6 +149,8 @@ AS_CASE([$host_os],
     abi_wcsl=yes
   ],
   [*-musl*], [
+    api_time_macros=no
+
     abi_accmode=yes
     abi_arc4random=yes
     abi_arc4random_stir=yes
@@ -209,6 +215,8 @@ AS_CASE([$host_os],
     abi_wcsl=yes
   ],
   [darwin*], [
+    api_time_macros=no
+
     abi_accmode=no
     abi_arc4random=no
     abi_arc4random_stir=no
@@ -255,6 +263,8 @@ AS_CASE([$host_os],
     abi_wcsl=no
   ],
   [solaris2*], [
+    api_time_macros=yes
+
     abi_accmode=yes
     abi_arc4random=no
     abi_arc4random_stir=no
@@ -301,6 +311,8 @@ AS_CASE([$host_os],
     abi_wcsl=yes
   ],
   [aix*], [
+    api_time_macros=yes
+
     abi_accmode=yes
     abi_arc4random=yes
     abi_arc4random_stir=yes
@@ -545,6 +557,9 @@ AC_CHECK_FUNCS([\
 
 AM_CONDITIONAL([HAVE_GETENTROPY], [test "x$ac_cv_func_getentropy" = "xyes"])
 
+# API selection
+LIBBSD_SELECT_API([time_macros], [time struct conversion macros])
+
 # ABI selection
 LIBBSD_SELECT_ABI([accmode], [setmode()/getmode()])
 LIBBSD_SELECT_ABI([arc4random], [arc4random() API])
diff --git a/m4/libbsd-compiler.m4 b/m4/libbsd-compiler.m4
index 0708f57..ace5ce1 100644
--- a/m4/libbsd-compiler.m4
+++ b/m4/libbsd-compiler.m4
@@ -71,6 +71,22 @@ int main() { return rc; }
     [test "$libbsd_cv_gnu_init_array_support" = yes])
 ])
 
+# LIBBSD_SELECT_API(name, desc)
+# -----------------
+AC_DEFUN([LIBBSD_SELECT_API], [
+  AS_IF([test -z "$AS_TR_SH([api_$1])"], [
+    AC_MSG_ERROR([missing API selection for $1])
+  ], [test "$AS_TR_SH([api_$1])" = "unknown"], [
+    AC_MSG_ERROR([unknown ABI selection for $1])
+  ], [test "$AS_TR_SH([api_$1])" = "yes"], [
+    AC_DEFINE(AS_TR_CPP([LIBBSD_API_$1]), [1], [Provide API for $2])
+  ], [
+    AC_DEFINE(AS_TR_CPP([LIBBSD_API_$1]), [0])
+  ])
+  AM_CONDITIONAL(AS_TR_CPP([API_$1]),
+    [test "x$AS_TR_SH([api_$1])" = "xyes"])
+])
+
 # LIBBSD_SELECT_ABI(name, desc)
 # -----------------
 AC_DEFUN([LIBBSD_SELECT_ABI], [
diff --git a/man/Makefile.am b/man/Makefile.am
index cb2252b..02c8ffb 100644
--- a/man/Makefile.am
+++ b/man/Makefile.am
@@ -141,8 +141,6 @@ dist_man_MANS = \
 	TAILQ_PREV.3bsd \
 	TAILQ_REMOVE.3bsd \
 	TAILQ_SWAP.3bsd \
-	TIMESPEC_TO_TIMEVAL.3bsd \
-	TIMEVAL_TO_TIMESPEC.3bsd \
 	be16dec.3bsd \
 	be16enc.3bsd \
 	be32dec.3bsd \
@@ -182,6 +180,13 @@ dist_man_MANS = \
 	tree.3bsd \
 	# EOL
 
+if API_TIME_MACROS
+dist_man_MANS += \
+	TIMESPEC_TO_TIMEVAL.3bsd \
+	TIMEVAL_TO_TIMESPEC.3bsd \
+	# EOL
+endif
+
 if ABI_ACCMODE
 dist_man_MANS += \
 	getmode.3bsd \