diff --git a/3rdparty/Makefile b/3rdparty/Makefile
index 1e710f28..dd0241d6 100644
--- a/3rdparty/Makefile
+++ b/3rdparty/Makefile
@@ -25,7 +25,7 @@ SDL = SDL-1.2.15
 SDLARCH = $(SDL).tar.gz
 SDLSIG = $(SDLARCH).sig
 SDLURL = https://www.libsdl.org/release/$(SDLARCH)
-SDLURLSIG = $(SDLURL).sig
+SDLSIGURL = $(SDLURL).sig
 SDLSHA256 = d6d316a793e5e348155f0dd93b979798933fb98aa1edebcc108829d6474aad00
 SDLPATCHES = SDL-1.2.15-patch-src_video_x11_SDL_x11sym.h \
              SDL-1.2.15-quartzvideo.patch \
@@ -67,13 +67,17 @@ SDL2DEVELSHA256 = e614a60f797e35ef9f3f96aef3dc6a1d786de3cc7ca6216f97e435c0b6aafc
 SDL2IMAGEVER = 2.0.5
 SDL2IMAGE = SDL2_image-$(SDL2IMAGEVER)
 SDL2IMAGEARCH = $(SDL2IMAGE).tar.gz
+SDL2IMAGESIG = $(SDL2IMAGEARCH).sig
 SDL2IMAGEURL = https://www.libsdl.org/projects/SDL_image/release/$(SDL2IMAGEARCH)
+SDL2IMAGESIGURL = $(SDL2IMAGEURL).sig
 SDL2IMAGESHA256 = bdd5f6e026682f7d7e1be0b6051b209da2f402a2dd8bd1c4bd9c25ad263108d0
 LATESTSDL2IMAGEVER = $(shell curl -s -S https://www.libsdl.org/projects/SDL_image/|grep release/|grep .tar.gz |head -n1|sed 's/.*SDL2_image-\([0-9.]*\).tar.gz.*/\1/')
 SDL2TTFVER = 2.0.15
 SDL2TTF = SDL2_ttf-$(SDL2TTFVER)
 SDL2TTFARCH = $(SDL2TTF).tar.gz
+SDL2TTFSIG = $(SDL2TTFARCH).sig
 SDL2TTFURL = https://www.libsdl.org/projects/SDL_ttf/release/$(SDL2TTFARCH)
+SDL2TTFSIGURL = $(SDL2TTFURL).sig
 SDL2TTFSHA256 = a9eceb1ad88c1f1545cd7bd28e7cbc0b2c14191d40238f531a15b01b1b22cd33
 LATESTSDL2TTFVER = $(shell curl -s -S https://www.libsdl.org/projects/SDL_ttf/|grep release/|grep .tar.gz |head -n1|sed 's/.*SDL2_ttf-\([0-9.]*\).tar.gz.*/\1/')
 LIBPNGVER = 1.6.37