diff --git a/package/heirloom-mailx/Config.in b/package/heirloom-mailx/Config.in
index ca83dc365..a2521ef66 100644
--- a/package/heirloom-mailx/Config.in
+++ b/package/heirloom-mailx/Config.in
@@ -2,6 +2,7 @@ config BR2_PACKAGE_HEIRLOOM_MAILX
 	bool "heirloom-mailx"
 	# uses fork()
 	depends on BR2_USE_MMU
+	depends on !BR2_PREFER_STATIC_LIB
 	help
 	  Heirloom mailx (previously known as nail) is a mail user
 	  agent for Unix systems.
@@ -13,3 +14,7 @@ config BR2_PACKAGE_HEIRLOOM_MAILX
 	  cram-md5), SMTPS, MIME encoding of attachements, and more.
 
 	  http://heirloom.sourceforge.net/mailx.html
+
+comment "heirloom-mailx needs a toolchain w/ dynamic library"
+	depends on BR2_PREFER_STATIC_LIB
+	depends on BR2_USE_MMU