Pass in OpenBSD binary path using preprocessor option

Alternative to hard coding binary path for OpenBSD

src/Makefile

@@ -55,7 +55,7 @@ else ifeq ($(os),Haiku)
     LIBS += -lncursesw -lnetwork -lbe
 else ifeq ($(os),OpenBSD)
     LIBS += -lncursesw
-    CPPFLAGS += -I/usr/local/include
+    CPPFLAGS += -D'KAK_BIN_PATH="$(bindir)/kak"' -I/usr/local/include
     LDFLAGS += -L/usr/local/lib
 else ifneq (,$(findstring CYGWIN,$(os)))
     CPPFLAGS += -D_XOPEN_SOURCE=700

src/file.cc

@@ -573,7 +573,7 @@ String get_kak_binary_path()
     buffer[res] = '\0';
     return buffer;
 #elif defined(__OpenBSD__)
-    return "/usr/local/bin/";
+    return KAK_BIN_PATH;
 #else
 # error "finding executable path is not implemented on this platform"
 #endif