diff --git a/tests/recipes/06_test_sha256sum b/tests/recipes/06_test_sha256sum
index 6578719..8197c39 100644
--- a/tests/recipes/06_test_sha256sum
+++ b/tests/recipes/06_test_sha256sum
@@ -18,7 +18,7 @@ if [ -s "test.exe" ]
       fi
     rm -f "sha256sum_exe.log"
   else
-    skip=$($skip+1)
+    skip=$(($skip+1))
   fi
 
 if [ -s "test.ex_" ]
@@ -33,7 +33,7 @@ if [ -s "test.ex_" ]
       fi
     rm -f "sha256sum_ex_.log"
   else
-    skip=$($skip+1)
+    skip=$(($skip+1))
   fi
 
 if [ -s "sample.msi" ]
diff --git a/tests/recipes/07_sign_timestamp b/tests/recipes/07_sign_timestamp
index b58dbc8..d5a0c66 100644
--- a/tests/recipes/07_sign_timestamp
+++ b/tests/recipes/07_sign_timestamp
@@ -7,7 +7,7 @@ script_path=$(pwd)
 # PE file
 test_name="071. Sign a PE file with Authenticode timestamping"
 printf "\n%s\n" "$test_name"
-if [ -s "test.exe" ]
+if [ -s "test.exe" ] && ! grep -q "no libcurl available" "results.log"
   then
     ../../osslsigncode sign -h sha256 \
         -st "1556668800" \
@@ -24,7 +24,7 @@ if [ -s "test.exe" ]
 # CAB file
 test_name="072. Sign a CAB file with Authenticode timestamping"
 printf "\n%s\n" "$test_name"
-if [ -s "test.ex_" ]
+if [ -s "test.ex_" ] && ! grep -q "no libcurl available" "results.log"
   then
     ../../osslsigncode sign -h sha256 \
         -st "1556668800" \
@@ -41,7 +41,7 @@ if [ -s "test.ex_" ]
 # MSI file
 test_name="073. Sign a MSI file with Authenticode timestamping"
 printf "\n%s\n" "$test_name"
-if [ -s "sample.msi" ]
+if [ -s "sample.msi" ] && ! grep -q "no libcurl available" "results.log"
   then
     ../../osslsigncode sign -h sha256 \
         -st "1556668800" \
diff --git a/tests/recipes/08_sign_rfc3161 b/tests/recipes/08_sign_rfc3161
index 682ab23..d400209 100644
--- a/tests/recipes/08_sign_rfc3161
+++ b/tests/recipes/08_sign_rfc3161
@@ -11,7 +11,7 @@ script_path=$(pwd)
 # PE file
 test_name="081. Sign a PE file with RFC 3161 timestamping"
 printf "\n%s\n" "$test_name"
-if [ -s "test.exe" ]
+if [ -s "test.exe" ] && ! grep -q "no libcurl available" "results.log"
   then
     ../../osslsigncode sign -h sha256 \
         -st "1556668800" \
@@ -28,7 +28,7 @@ if [ -s "test.exe" ]
 # CAB file
 test_name="082. Sign a CAB file with RFC 3161 timestamping"
 printf "\n%s\n" "$test_name"
-if [ -s "test.ex_" ]
+if [ -s "test.ex_" ] && ! grep -q "no libcurl available" "results.log"
   then
     ../../osslsigncode sign -h sha256 \
         -st "1556668800" \
@@ -45,7 +45,7 @@ if [ -s "test.ex_" ]
 # MSI file
 test_name="083. Sign a MSI file with RFC 3161 timestamping"
 printf "\n%s\n" "$test_name"
-if [ -s "sample.msi" ]
+if [ -s "sample.msi" ] && ! grep -q "no libcurl available" "results.log"
   then
     ../../osslsigncode sign -h sha256 \
         -st "1556668800" \
diff --git a/tests/recipes/35_varia_sha256sum b/tests/recipes/35_varia_sha256sum
index 7017a64..60cd72b 100644
--- a/tests/recipes/35_varia_sha256sum
+++ b/tests/recipes/35_varia_sha256sum
@@ -19,7 +19,7 @@ if [ -s "test.exe" ]
       fi
     rm -f "sha256sum_exe.log"
   else
-    skip=$($skip+1)
+    skip=$(($skip+1))
   fi
 
 if [ -s "sample.msi" ]
diff --git a/tests/recipes/37_add_signature_timestamp b/tests/recipes/37_add_signature_timestamp
index c32c6ad..fffb6e7 100644
--- a/tests/recipes/37_add_signature_timestamp
+++ b/tests/recipes/37_add_signature_timestamp
@@ -7,7 +7,7 @@ script_path=$(pwd)
 # PE file
 test_name="371. Add an authenticode timestamp to the PE file"
 printf "\n%s\n" "$test_name"
-if [ -s "test.exe" ]
+if [ -s "test.exe" ] && ! grep -q "no libcurl available" "results.log"
   then
     ../../osslsigncode sign -h sha256 \
         -st "1556668800" \
@@ -29,7 +29,7 @@ if [ -s "test.exe" ]
 # MSI file
 test_name="372. Add an authenticode timestamp to the MSI file"
 printf "\n%s\n" "$test_name"
-if [ -s "sample.msi" ]
+if [ -s "sample.msi" ] && ! grep -q "no libcurl available" "results.log"
   then
     ../../osslsigncode sign -h sha256 \
         -st "1556668800" \
diff --git a/tests/recipes/38_add_signature_rfc3161 b/tests/recipes/38_add_signature_rfc3161
index d676a4a..7372516 100644
--- a/tests/recipes/38_add_signature_rfc3161
+++ b/tests/recipes/38_add_signature_rfc3161
@@ -7,7 +7,7 @@ script_path=$(pwd)
 # PE file
 test_name="381. Add RFC 3161 timestamp to signed PE file"
 printf "\n%s\n" "$test_name"
-if [ -s "test.exe" ]
+if [ -s "test.exe" ] && ! grep -q "no libcurl available" "results.log"
   then
     ../../osslsigncode sign -h sha256 \
         -st "1556668800" \
@@ -29,7 +29,7 @@ if [ -s "test.exe" ]
 # MSI file
 test_name="382. Add RFC 3161 timestamp to signed MSI file"
 printf "\n%s\n" "$test_name"
-if [ -s "sample.msi" ]
+if [ -s "sample.msi" ] && ! grep -q "no libcurl available" "results.log"
   then
     ../../osslsigncode sign -h sha256 \
         -st "1556668800" \
diff --git a/tests/recipes/46_verify_timestamp b/tests/recipes/46_verify_timestamp
index c3ebdb5..ac9ead3 100644
--- a/tests/recipes/46_verify_timestamp
+++ b/tests/recipes/46_verify_timestamp
@@ -8,7 +8,7 @@ script_path=$(pwd)
 # PE file
 test_name="461. Verify changed PE file after signing with Authenticode timestamping"
 printf "\n%s\n" "$test_name"
-if [ -s "test.exe" ]
+if [ -s "test.exe" ] && ! grep -q "no libcurl available" "results.log"
   then
     ../../osslsigncode sign -h sha256 \
         -st "1556668800" \
diff --git a/tests/recipes/47_verify_rfc3161 b/tests/recipes/47_verify_rfc3161
index 6157ef5..c5ab544 100755
--- a/tests/recipes/47_verify_rfc3161
+++ b/tests/recipes/47_verify_rfc3161
@@ -8,7 +8,7 @@ script_path=$(pwd)
 # PE file
 test_name="471. Verify changed PE file after signing with RFC 3161 timestamping"
 printf "\n%s\n" "$test_name"
-if [ -s "test.exe" ]
+if [ -s "test.exe" ] && ! grep -q "no libcurl available" "results.log"
   then
     ../../osslsigncode sign -h sha256 \
         -st "1556668800" \
diff --git a/tests/recipes/52_verify_timestamp b/tests/recipes/52_verify_timestamp
index 85a20b0..0971457 100644
--- a/tests/recipes/52_verify_timestamp
+++ b/tests/recipes/52_verify_timestamp
@@ -6,7 +6,7 @@
 # PE file
 test_name="521. Verify PE file signature with timestamping after the cert has been expired"
 printf "\n%s\n" "$test_name"
-if [ -s "test.exe" ]
+if [ -s "test.exe" ] && ! grep -q "no libcurl available" "results.log"
   then
     TZ=GMT faketime -f '@2019-05-01 00:00:00' /bin/bash -c '
         script_path=$(pwd)
@@ -27,7 +27,7 @@ if [ -s "test.exe" ]
 # MSI file
 test_name="523. Verify MSI file signature with timestamping after the cert has been expired"
 printf "\n%s\n" "$test_name"
-if [ -s "sample.msi" ]
+if [ -s "sample.msi" ] && ! grep -q "no libcurl available" "results.log"
   then
     TZ=GMT faketime -f '@2019-05-01 00:00:00' /bin/bash -c '
         script_path=$(pwd)
diff --git a/tests/recipes/53_verify_rfc3161 b/tests/recipes/53_verify_rfc3161
index a75109c..51226ba 100644
--- a/tests/recipes/53_verify_rfc3161
+++ b/tests/recipes/53_verify_rfc3161
@@ -6,7 +6,7 @@
 # PE file
 test_name="531. Verify PE file signature with RFC3161 after the cert has been expired"
 printf "\n%s\n" "$test_name"
-if [ -s "test.exe" ]
+if [ -s "test.exe" ] && ! grep -q "no libcurl available" "results.log"
   then
     TZ=GMT faketime -f '@2019-05-01 00:00:00' /bin/bash -c '
         script_path=$(pwd)
@@ -27,7 +27,7 @@ if [ -s "test.exe" ]
 # MSI file
 test_name="533. Verify MSI file signature with RFC3161 after the cert has been expired"
 printf "\n%s\n" "$test_name"
-if [ -s "sample.msi" ]
+if [ -s "sample.msi" ] && ! grep -q "no libcurl available" "results.log"
   then
     TZ=GMT faketime -f '@2019-05-01 00:00:00' /bin/bash -c '
         script_path=$(pwd)
diff --git a/tests/recipes/54_verify_expired b/tests/recipes/54_verify_expired
index 405b512..2acff2f 100644
--- a/tests/recipes/54_verify_expired
+++ b/tests/recipes/54_verify_expired
@@ -6,7 +6,7 @@
 # PE file
 test_name="541. Verify PE file signed with the expired cert"
 printf "\n%s\n" "$test_name"
-if [ -s "test.exe" ]
+if [ -s "test.exe" ] && ! grep -q "no libcurl available" "results.log"
   then
     TZ=GMT faketime -f '@2019-05-01 00:00:00' /bin/bash -c '
         script_path=$(pwd)
@@ -27,7 +27,7 @@ if [ -s "test.exe" ]
 # MSI file
 test_name="543. Verify MSI file signed with the expired cert"
 printf "\n%s\n" "$test_name"
-if [ -s "sample.msi" ]
+if [ -s "sample.msi" ] && ! grep -q "no libcurl available" "results.log"
   then
     TZ=GMT faketime -f '@2019-05-01 00:00:00' /bin/bash -c '
         script_path=$(pwd)