Someone help me? rtl8187se [FreeBSD 11.0]

Well, my name is Matias, I am from Argentina. I'm new user of FreeBSD (thanks!!! changed of win) But I have problem with one card, no driver. After much read in this forum about this card (old, old topics) I think could be have one solution now, REMEMBER I'M NEW USER, and I don't know good this system.

my practique;

ndisgen net8187Se.inf rtl8187Se.sys
"Building kernel module... make: "/usr/share/mk/" line 12: Unable to locate the kernel source tree. Set SYSDIR to override.
build failed. Exiting."
Thanks for your time, sorry for my bad English.
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