build(makefile): add slf4j dependency

Makefile

@@ -14,6 +14,7 @@ DOCKER_RUN_OPTS=--rm
 MVN:=mvn
 CODESIGN:=docker run $(DOCKER_RUN_OPTS) -v $$PWD:/workdir gotson/rcodesign sign
 SRC:=src/main/java
+JAVA_CLASSPATH:=$(TARGET)/classpath/slf4j-api.jar
 SQLITE_OUT:=$(TARGET)/$(sqlite)-$(OS_NAME)-$(OS_ARCH)
 SQLITE_OBJ?=$(SQLITE_OUT)/sqlite3.o
 SQLITE_ARCHIVE:=$(TARGET)/$(sqlite)-amal.zip
@@ -42,16 +43,19 @@ $(SQLITE_UNPACKED): $(SQLITE_ARCHIVE)
 	(mv $(TARGET)/tmp.$(version)/$(SQLITE_AMAL_PREFIX) $(TARGET) && rmdir $(TARGET)/tmp.$(version)) || mv $(TARGET)/tmp.$(version)/ $(TARGET)/$(SQLITE_AMAL_PREFIX)
 	touch $@
 
+$(JAVA_CLASSPATH):
+	@mkdir -p $(@D)
+	curl -L -f -o$@ https://search.maven.org/remotecontent?filepath=org/slf4j/slf4j-api/2.0.9/slf4j-api-2.0.9.jar
 
 $(TARGET)/common-lib/org/sqlite/%.class: src/main/java/org/sqlite/%.java
 	@mkdir -p $(@D)
 	$(JAVAC) -source 1.6 -target 1.6 -sourcepath $(SRC) -d $(TARGET)/common-lib $<
 
 jni-header: $(TARGET)/common-lib/NativeDB.h
 
-$(TARGET)/common-lib/NativeDB.h: src/main/java/org/sqlite/core/NativeDB.java
+$(TARGET)/common-lib/NativeDB.h: src/main/java/org/sqlite/core/NativeDB.java $(JAVA_CLASSPATH)
 	@mkdir -p $(TARGET)/common-lib
-	$(JAVAC) -d $(TARGET)/common-lib -sourcepath $(SRC) -h $(TARGET)/common-lib src/main/java/org/sqlite/core/NativeDB.java
+	$(JAVAC) -cp $(JAVA_CLASSPATH) -d $(TARGET)/common-lib -sourcepath $(SRC) -h $(TARGET)/common-lib src/main/java/org/sqlite/core/NativeDB.java
 	mv target/common-lib/org_sqlite_core_NativeDB.h target/common-lib/NativeDB.h
 
 test:

Makefile.common

@@ -9,20 +9,24 @@ JAVAC := "$$JAVA_HOME/bin/javac"
 JAVAH := "$$JAVA_HOME/bin/javah"
 
 TARGET := target
+SRC:=src/main/java
 OSINFO_CLASS := org.sqlite.util.OSInfo
 OSINFO_PROG := lib/org/sqlite/util/OSInfo.class
+JAVA_CLASSPATH:=$(TARGET)/classpath/slf4j-api.jar
 
 ## building OSInfo.java
 ifeq ("$(wildcard $(OSINFO_PROG))","")
 $(info Building OSInfo tool)
-$(shell $(JAVAC) -cp src/main/java -d lib src/main/java/org/sqlite/util/OSInfo.java)
+$(shell mkdir -p $(TARGET)/classpath)
+$(shell curl -L -f -o$(JAVA_CLASSPATH) https://search.maven.org/remotecontent?filepath=org/slf4j/slf4j-api/2.0.9/slf4j-api-2.0.9.jar)
+$(shell $(JAVAC) -cp $(JAVA_CLASSPATH) -sourcepath $(SRC) -d lib src/main/java/org/sqlite/util/OSInfo.java)
 endif
 
 ifndef OS_NAME
-OS_NAME := $(shell $(JAVA) -cp lib $(OSINFO_CLASS) --os)
+OS_NAME := $(shell $(JAVA) -cp lib:$(JAVA_CLASSPATH) $(OSINFO_CLASS) --os)
 endif
 ifndef OS_ARCH
-OS_ARCH := $(shell $(JAVA) -cp lib $(OSINFO_CLASS) --arch)
+OS_ARCH := $(shell $(JAVA) -cp lib:$(JAVA_CLASSPATH) $(OSINFO_CLASS) --arch)
 endif
 
 # Windows uses different path separators
@@ -55,7 +59,7 @@ ifeq (,$(findstring $(strip $(target)),$(known_targets)))
   target := Default
 endif
 
-$(info Will build using target: $(target) (detected os: $(OS_NAME) arch: $(OS_ARCH)))
+$(info Will build using target: $(target) (detected os: $(OS_NAME), arch: $(OS_ARCH)))
 
 # cross-compilation toolchain prefix (e.g. "arm-linux-gnueabi-")
 CROSS_PREFIX :=