diff --git a/package/collectd/Config.in b/package/collectd/Config.in
index 70b0439568..daa96033fe 100644
--- a/package/collectd/Config.in
+++ b/package/collectd/Config.in
@@ -58,12 +58,16 @@ config BR2_PACKAGE_COLLECTD_LOGFILE
 
 config BR2_PACKAGE_COLLECTD_NOTIFY_EMAIL
 	bool "notify_email"
+	depends on !BR2_PREFER_STATIC_LIB # libesmtp
 	select BR2_PACKAGE_LIBESMTP
 	select BR2_PACKAGE_OPENSSL
 	help
 	  Send an E-mail with the notification message to the
 	  configured recipients.
 
+comment "notify_email needs a toolchain w/ dynamic library"
+	depends on BR2_PREFER_STATIC_LIB
+
 config BR2_PACKAGE_COLLECTD_SYSLOG
 	bool "syslog"
 	default y
diff --git a/package/libesmtp/Config.in b/package/libesmtp/Config.in
index 4e9e455d81..42a1c08296 100644
--- a/package/libesmtp/Config.in
+++ b/package/libesmtp/Config.in
@@ -1,6 +1,10 @@
 config BR2_PACKAGE_LIBESMTP
 	bool "libesmtp"
+	depends on !BR2_PREFER_STATIC_LIB
 	help
 	  Library for sending emails through SMTP.
 
 	  http://www.stafford.uklinux.net/libesmtp
+
+comment "libesmtp needs a toolchain w/ dynamic library"
+	depends on BR2_PREFER_STATIC_LIB