diff --git a/scripts.d/25-gmp.sh b/scripts.d/25-gmp.sh
index 422d267..e1c516a 100755
--- a/scripts.d/25-gmp.sh
+++ b/scripts.d/25-gmp.sh
@@ -3,7 +3,7 @@
 GMP_SRC="https://ftp.gnu.org/gnu/gmp/gmp-6.2.1.tar.xz"
 
 ffbuild_enabled() {
-    return 0
+    return -1
 }
 
 ffbuild_dockerbuild() {
diff --git a/scripts.d/50-librist/40-mbedtls.sh b/scripts.d/50-librist/40-mbedtls.sh
index 2935c67..19617db 100755
--- a/scripts.d/50-librist/40-mbedtls.sh
+++ b/scripts.d/50-librist/40-mbedtls.sh
@@ -5,7 +5,7 @@ MBEDTLS_REPO="https://github.com/ARMmbed/mbedtls.git"
 MBEDTLS_COMMIT="1e313165f307df6ffc57ea52363eabcf148f494d"
 
 ffbuild_enabled() {
-    return 0
+    return -1
 }
 
 ffbuild_dockerbuild() {
diff --git a/scripts.d/50-librist/50-librist.sh b/scripts.d/50-librist/50-librist.sh
index eb3bc8b..2b855ef 100755
--- a/scripts.d/50-librist/50-librist.sh
+++ b/scripts.d/50-librist/50-librist.sh
@@ -4,7 +4,7 @@ LIBRIST_REPO="https://code.videolan.org/rist/librist.git"
 LIBRIST_COMMIT="0b1aaf995c4cad83d562ec7887180cc6ee132c84"
 
 ffbuild_enabled() {
-    return 0
+    return -1
 }
 
 ffbuild_dockerbuild() {
diff --git a/scripts.d/50-lilv/96-lv2.sh b/scripts.d/50-lilv/96-lv2.sh
index d8d43d7..df2a43f 100755
--- a/scripts.d/50-lilv/96-lv2.sh
+++ b/scripts.d/50-lilv/96-lv2.sh
@@ -4,7 +4,7 @@ LV2_REPO="https://github.com/lv2/lv2.git"
 LV2_COMMIT="6cefc7df1a6158c79d23029df183c09b10b88cad"
 
 ffbuild_enabled() {
-    return 0
+    return -1
 }
 
 ffbuild_dockerbuild() {
diff --git a/scripts.d/50-lilv/96-serd.sh b/scripts.d/50-lilv/96-serd.sh
index a84d358..874aee9 100755
--- a/scripts.d/50-lilv/96-serd.sh
+++ b/scripts.d/50-lilv/96-serd.sh
@@ -4,7 +4,7 @@ SERD_REPO="https://github.com/drobilla/serd.git"
 SERD_COMMIT="c05fdaa19be53ef618435d3629122a4ebdc7cb63"
 
 ffbuild_enabled() {
-    return 0
+    return -1
 }
 
 ffbuild_dockerbuild() {
diff --git a/scripts.d/50-lilv/97-sord.sh b/scripts.d/50-lilv/97-sord.sh
index 0930117..cc86458 100755
--- a/scripts.d/50-lilv/97-sord.sh
+++ b/scripts.d/50-lilv/97-sord.sh
@@ -4,7 +4,7 @@ SORD_REPO="https://github.com/drobilla/sord.git"
 SORD_COMMIT="d2efdb2d026216449599350b55c2c85c0d3efb89"
 
 ffbuild_enabled() {
-    return 0
+    return -1
 }
 
 ffbuild_dockerbuild() {
diff --git a/scripts.d/50-lilv/98-sratom.sh b/scripts.d/50-lilv/98-sratom.sh
index b325e2f..d4da1de 100755
--- a/scripts.d/50-lilv/98-sratom.sh
+++ b/scripts.d/50-lilv/98-sratom.sh
@@ -4,7 +4,7 @@ SRATOM_REPO="https://github.com/lv2/sratom.git"
 SRATOM_COMMIT="c46452c83d442de137fa6470ba544e3ba142e923"
 
 ffbuild_enabled() {
-    return 0
+    return -1
 }
 
 ffbuild_dockerbuild() {
diff --git a/scripts.d/50-lilv/99-lilv.sh b/scripts.d/50-lilv/99-lilv.sh
index 5a15b13..6833412 100755
--- a/scripts.d/50-lilv/99-lilv.sh
+++ b/scripts.d/50-lilv/99-lilv.sh
@@ -4,7 +4,7 @@ LILV_REPO="https://github.com/lv2/lilv.git"
 LILV_COMMIT="71a2ff5170caaa052814cce19b3de927d10d0e24"
 
 ffbuild_enabled() {
-    return 0
+    return -1
 }
 
 ffbuild_dockerbuild() {
diff --git a/scripts.d/50-vulkan/50-shaderc.sh b/scripts.d/50-vulkan/50-shaderc.sh
index 45ac68c..76d3252 100755
--- a/scripts.d/50-vulkan/50-shaderc.sh
+++ b/scripts.d/50-vulkan/50-shaderc.sh
@@ -5,7 +5,7 @@ SHADERC_COMMIT="657c5ed2ba1714c0430895a274a94d6f2aeeab85"
 
 ffbuild_enabled() {
     [[ $ADDINS_STR == *4.4* ]] && return -1
-    return 0
+    return -1
 }
 
 ffbuild_dockerbuild() {
diff --git a/scripts.d/50-vulkan/55-spirv-cross.sh b/scripts.d/50-vulkan/55-spirv-cross.sh
index a952031..e04cb72 100755
--- a/scripts.d/50-vulkan/55-spirv-cross.sh
+++ b/scripts.d/50-vulkan/55-spirv-cross.sh
@@ -5,7 +5,7 @@ SPIRV_CROSS_COMMIT="e9cc6403341baf0edd430a4027b074d0a06b782f"
 
 ffbuild_enabled() {
     [[ $ADDINS_STR == *4.4* ]] && return -1
-    return 0
+    return -1
 }
 
 ffbuild_dockerbuild() {
diff --git a/scripts.d/50-vulkan/60-libplacebo.sh b/scripts.d/50-vulkan/60-libplacebo.sh
index 47831c5..d44ab54 100755
--- a/scripts.d/50-vulkan/60-libplacebo.sh
+++ b/scripts.d/50-vulkan/60-libplacebo.sh
@@ -5,7 +5,7 @@ PLACEBO_COMMIT="5e8fdf2316c2d5531531a07c782410c860faaf18"
 
 ffbuild_enabled() {
     [[ $ADDINS_STR == *4.4* ]] && return -1
-    return 0
+    return -1
 }
 
 ffbuild_dockerbuild() {
diff --git a/scripts.d/50-zimg.sh b/scripts.d/50-zimg.sh
index b42fc6d..0d50f73 100755
--- a/scripts.d/50-zimg.sh
+++ b/scripts.d/50-zimg.sh
@@ -4,7 +4,7 @@ ZIMG_REPO="https://github.com/sekrit-twc/zimg.git"
 ZIMG_COMMIT="d2495cab859570112102ef40269a900b81009667"
 
 ffbuild_enabled() {
-    return 0
+    return -1
 }
 
 ffbuild_dockerbuild() {
diff --git a/scripts.d/50-zvbi.sh b/scripts.d/50-zvbi.sh
index f3670ce..5d61ae4 100755
--- a/scripts.d/50-zvbi.sh
+++ b/scripts.d/50-zvbi.sh
@@ -4,7 +4,7 @@ ZVBI_REPO="https://svn.code.sf.net/p/zapping/svn/trunk/vbi"
 ZVBI_REV="4270"
 
 ffbuild_enabled() {
-    return 0
+    return -1
 }
 
 ffbuild_dockerstage() {
diff --git a/variants/defaults-gpl-shared.sh b/variants/defaults-gpl-shared.sh
index 05e6979..c6b78fb 100644
--- a/variants/defaults-gpl-shared.sh
+++ b/variants/defaults-gpl-shared.sh
@@ -1,4 +1,4 @@
 #!/bin/bash
 source "$(dirname "$BASH_SOURCE")"/defaults-gpl.sh
 #FF_CONFIGURE+=" --enable-shared --disable-static --disable-programs --disable-filters --disable-devices --disable-encoders --disable-muxers --disable-protocols"
-FF_CONFIGURE+=" --enable-shared --disable-static --disable-filters --disable-devices --disable-encoders"
+FF_CONFIGURE+=" --enable-shared --disable-static --disable-filters --disable-devices --disable-encoders --disable-muxers"