diff --git a/libraries/source/cpp-httplib/build.sh b/libraries/source/cpp-httplib/build.sh
index 9bdab7f292..28c8172423 100755
--- a/libraries/source/cpp-httplib/build.sh
+++ b/libraries/source/cpp-httplib/build.sh
@@ -33,6 +33,8 @@ echo "Building cpp-httplib..."
 if [ -e .already-built ] && [ "$(cat .already-built || true)" = "${LIB_VERSION}" ]; then
 	echo "Skipping - already built (use --force-rebuild to override)"
 	exit
+else
+	rm -f .already-built
 fi
 
 # fetch
diff --git a/libraries/source/cxxtest-4.4/build.sh b/libraries/source/cxxtest-4.4/build.sh
index fe953dd108..34dc073c06 100755
--- a/libraries/source/cxxtest-4.4/build.sh
+++ b/libraries/source/cxxtest-4.4/build.sh
@@ -33,6 +33,8 @@ done
 if [ -e .already-built ] && [ "$(cat .already-built || true)" = "${LIB_VERSION}" ]; then
 	echo "Skipping - already built (use --force-rebuild to override)"
 	exit
+else
+	rm -f .already-built
 fi
 
 # fetch
diff --git a/libraries/source/fcollada/build.sh b/libraries/source/fcollada/build.sh
index 75de15514e..c6e2b7609f 100755
--- a/libraries/source/fcollada/build.sh
+++ b/libraries/source/fcollada/build.sh
@@ -49,6 +49,8 @@ done
 if [ -e .already-built ] && [ "$(cat .already-built || true)" = "${LIB_VERSION}" ]; then
 	echo "Skipping - already built (use --force-rebuild to override)"
 	exit
+else
+	rm -f .already-built
 fi
 
 # fetch
diff --git a/libraries/source/nvtt/build.sh b/libraries/source/nvtt/build.sh
index f05ce283e5..bb914a27c6 100755
--- a/libraries/source/nvtt/build.sh
+++ b/libraries/source/nvtt/build.sh
@@ -49,6 +49,8 @@ done
 if [ -e .already-built ] && [ "$(cat .already-built || true)" = "${LIB_VERSION}" ]; then
 	echo "Skipping - already built (use --force-rebuild to override)"
 	exit
+else
+	rm -f .already-built
 fi
 
 # fetch
diff --git a/libraries/source/premake-core/build.sh b/libraries/source/premake-core/build.sh
index b86ace276c..64459718a0 100755
--- a/libraries/source/premake-core/build.sh
+++ b/libraries/source/premake-core/build.sh
@@ -36,6 +36,8 @@ done
 if [ -e .already-built ] && [ "$(cat .already-built || true)" = "${LIB_VERSION}" ]; then
 	echo "Skipping - already built (use --force-rebuild to override)"
 	exit
+else
+	rm -f .already-built
 fi
 
 # fetch
diff --git a/libraries/source/spidermonkey/build.sh b/libraries/source/spidermonkey/build.sh
index 8e00a4214a..01d5322d63 100755
--- a/libraries/source/spidermonkey/build.sh
+++ b/libraries/source/spidermonkey/build.sh
@@ -56,6 +56,8 @@ echo "Building SpiderMonkey..."
 if [ -e .already-built ] && [ "$(cat .already-built || true)" = "${LIB_VERSION}" ]; then
 	echo "Skipping - already built (use --force-rebuild to override)"
 	exit
+else
+	rm -f .already-built
 fi
 
 OS="${OS:=$(uname -s)}"
diff --git a/libraries/source/spirv-reflect/build.sh b/libraries/source/spirv-reflect/build.sh
index 18874174c1..fac26f606e 100755
--- a/libraries/source/spirv-reflect/build.sh
+++ b/libraries/source/spirv-reflect/build.sh
@@ -33,6 +33,8 @@ done
 if [ -e .already-built ] && [ "$(cat .already-built || true)" = "${LIB_VERSION}" ]; then
 	echo "Skipping - already built (use --force-rebuild to override)"
 	exit
+else
+	rm -f .already-built
 fi
 
 # fetch