--- radare2-2.6.0/libr/config.mk.tail	2018-05-21 04:18:13.000000000 +0300
+++ config.mk.tail	2018-06-30 19:13:06.064000000 +0300
@@ -202,7 +202,7 @@
 libname-version = $(1).$(2)
 endif
 
-libpath-to-name = $(word 2,$(subst /, ,$(1)))
+libpath-to-name = $(if $(findstring /,$(1)),$(word 2,$(subst /, ,$(1))),$(1))
 libpath-to-name-version = $(call libname-version,$(call libpath-to-name,$(1)),$(2))
 
 # -- singleton