Fix installation paths.
--- rocksdb-3.12/Makefile.install_path	2015-07-21 02:11:02.000000000 +0200
+++ rocksdb-3.12/Makefile	2015-07-31 11:47:21.512002547 +0200
@@ -863,33 +863,36 @@
 
 #-------------------------------------------------
 # make install related stuff
-INSTALL_PATH ?= /usr/local
+INSTALL_PREFIX ?= /
+INCLUDE_INSTAL_DIR ?= /usr/local/include/
+LIB_INSTALL_DIR ?= /usr/local/lib/
+
 
 uninstall:
-	rm -rf $(INSTALL_PATH)/include/rocksdb \
-	  $(INSTALL_PATH)/lib/$(LIBRARY) \
-	  $(INSTALL_PATH)/lib/$(SHARED4) \
-	  $(INSTALL_PATH)/lib/$(SHARED3) \
-	  $(INSTALL_PATH)/lib/$(SHARED2) \
-	  $(INSTALL_PATH)/lib/$(SHARED1)
+	rm -rf $(INSTALL_PREFIX)/$(INCLUDE_INSTALL_DIR)/rocksdb \
+	  $(INSTALL_PREFIX)/$(LIB_INSTALL_DIR)/$(LIBRARY) \
+	  $(INSTALL_PREFIX)/$(LIB_INSTALL_DIR)/$(SHARED4) \
+	  $(INSTALL_PREFIX)/$(LIB_INSTALL_DIR)/$(SHARED3) \
+	  $(INSTALL_PREFIX)/$(LIB_INSTALL_DIR)/$(SHARED2) \
+	  $(INSTALL_PREFIX)/$(LIB_INSTALL_DIR)/$(SHARED1)
 
 install-headers:
-	install -d $(INSTALL_PATH)/lib
-	for header_dir in `find "include/rocksdb" -type d`; do \
-		install -d $(INSTALL_PATH)/$$header_dir; \
+	install -d $(INSTALL_PREFIX)/$(LIB_INSTALL_DIR)
+	for header_dir in $$(find "include/rocksdb" -type d|sed -r 's/^([^\/]*\/)//'); do \
+		install -d $(INSTALL_PREFIX)/$(INCLUDE_INSTALL_DIR)/$$header_dir; \
 	done
-	for header in `find "include/rocksdb" -type f -name *.h`; do \
-		install -C -m 644 $$header $(INSTALL_PATH)/$$header; \
+	for header in $$(find "include/rocksdb" -type f -name *.h|sed -r 's/^([^\/]*\/)//'); do \
+		install -C -m 644 "include/$$header" $(INSTALL_PREFIX)/$(INCLUDE_INSTALL_DIR)/$$header; \
 	done
 
 install-static: install-headers $(LIBRARY)
-	install -C -m 755 $(LIBRARY) $(INSTALL_PATH)/lib
+	install -C -m 755 $(LIBRARY) $(INSTALL_PREFIX)/$(LIB_INSTALL_DIR)
 
 install-shared: install-headers $(SHARED4)
-	install -C -m 755 $(SHARED4) $(INSTALL_PATH)/lib && \
-		ln -fs $(SHARED4) $(INSTALL_PATH)/lib/$(SHARED3) && \
-		ln -fs $(SHARED4) $(INSTALL_PATH)/lib/$(SHARED2) && \
-		ln -fs $(SHARED4) $(INSTALL_PATH)/lib/$(SHARED1)
+	install -C -m 755 $(SHARED4) $(INSTALL_PREFIX)/$(LIB_INSTALL_DIR) && \
+		ln -fs $(SHARED4) $(INSTALL_PREFIX)/$(LIB_INSTALL_DIR)/$(SHARED3) && \
+		ln -fs $(SHARED4) $(INSTALL_PREFIX)/$(LIB_INSTALL_DIR)/$(SHARED2) && \
+		ln -fs $(SHARED4) $(INSTALL_PREFIX)/$(LIB_INSTALL_DIR)/$(SHARED1)
 
 # install static by default + install shared if it exists
 install: install-static