diff --git a/abi_symbols b/abi_symbols
--- a/abi_symbols
+++ b/abi_symbols
@@ -96,7 +96,6 @@
 libnspr4.so:PR_DetachThread
 libnspr4.so:PR_DisableClockInterrupts
 libnspr4.so:PR_DuplicateEnvironment
-libnspr4.so:PR_EXPERIMENTAL_ONLY_IN_4_17_GetOverlappedIOHandle
 libnspr4.so:PR_EmulateAcceptRead
 libnspr4.so:PR_EmulateSendFile
 libnspr4.so:PR_EnableClockInterrupts
diff --git a/abi_symbols32 b/abi_symbols32
--- a/abi_symbols32
+++ b/abi_symbols32
@@ -96,7 +96,6 @@
 libnspr4.so:PR_DetachThread
 libnspr4.so:PR_DisableClockInterrupts
 libnspr4.so:PR_DuplicateEnvironment
-libnspr4.so:PR_EXPERIMENTAL_ONLY_IN_4_17_GetOverlappedIOHandle
 libnspr4.so:PR_EmulateAcceptRead
 libnspr4.so:PR_EmulateSendFile
 libnspr4.so:PR_EnableClockInterrupts
diff --git a/package.yml b/package.yml
--- a/package.yml
+++ b/package.yml
@@ -1,9 +1,9 @@
 name       : libnspr
-version    : '4.17'
-release    : 10
+version    : 4.18
+release    : 11
 source     :
-    - https://ftp.mozilla.org/pub/nspr/releases/v4.17/src/nspr-4.17.tar.gz : 590a0aea29412ae22d7728038c21ef2ab42646e48172a47d2e4bb782846d1095
-homepage   : http://www.mozilla.org
+    - https://ftp.mozilla.org/pub/nspr/releases/v4.18/src/nspr-4.18.tar.gz : b89657c09bf88707d06ac238b8930d3ae08de68cb3edccfdc2e3dc97f9c8fb34
+homepage   : https://developer.mozilla.org/en-US/docs/Mozilla/Projects/NSPR
 license    :
     - MPL-1.1
     - GPL-2.0
@@ -18,15 +18,21 @@
     pushd nspr
     sed -i 's#$(LIBRARY) ##' config/rules.mk
     if [[ ! -z "${EMUL32BUILD}" ]]; then
-        %configure --prefix=/usr --with-mozilla --with-pthreads
+        %configure --with-mozilla --with-pthreads
     else
-        %configure --prefix=/usr --enable-64bit  --with-mozilla --with-pthreads
+        %configure --enable-64bit  --with-mozilla --with-pthreads
     fi
 build      : |
-    pushd nspr
-    %make
+    %make -C nspr
 install    : |
-    pushd nspr
-    %make_install
+    %make_install -C nspr
     rm -v $installdir/usr/bin/prerr.properties
     rm -v $installdir/usr/bin/compile-et.pl
+check      : |
+    perl ./nspr/pr/tests/runtests.pl 2>&1 | tee output.log
+    TEST_FAILURES=`grep -c FAILED ./output.log` || :
+    if [ $TEST_FAILURES -ne 0 ]; then
+        echo "error: test suite returned failure(s)"
+        exit 1
+    fi
+    echo "test suite completed"
diff --git a/pspec_x86_64.xml b/pspec_x86_64.xml
--- a/pspec_x86_64.xml
+++ b/pspec_x86_64.xml
@@ -1,7 +1,7 @@
 <PISI>
     <Source>
         <Name>libnspr</Name>
-        <Homepage>http://www.mozilla.org</Homepage>
+        <Homepage>https://developer.mozilla.org/en-US/docs/Mozilla/Projects/NSPR</Homepage>
         <Packager>
             <Name>Pierre-Yves</Name>
             <Email>pyu@riseup.net</Email>
@@ -33,7 +33,7 @@
 </Description>
         <PartOf>emul32</PartOf>
         <RuntimeDependencies>
-            <Dependency release="10">libnspr</Dependency>
+            <Dependency release="11">libnspr</Dependency>
         </RuntimeDependencies>
         <Files>
             <Path fileType="library">/usr/lib32/lib*.so</Path>
@@ -46,8 +46,8 @@
 </Description>
         <PartOf>programming.devel</PartOf>
         <RuntimeDependencies>
-            <Dependency release="10">libnspr-32bit</Dependency>
-            <Dependency release="10">libnspr-devel</Dependency>
+            <Dependency release="11">libnspr-32bit</Dependency>
+            <Dependency release="11">libnspr-devel</Dependency>
         </RuntimeDependencies>
         <Files>
             <Path fileType="data">/usr/lib32/pkgconfig/*.pc</Path>
@@ -60,7 +60,7 @@
 </Description>
         <PartOf>programming.devel</PartOf>
         <RuntimeDependencies>
-            <Dependency release="10">libnspr</Dependency>
+            <Dependency release="11">libnspr</Dependency>
         </RuntimeDependencies>
         <Files>
             <Path fileType="header">/usr/include/</Path>
@@ -69,12 +69,12 @@
         </Files>
     </Package>
     <History>
-        <Update release="10">
-            <Date>2017-09-28</Date>
-            <Version>4.17</Version>
+        <Update release="11">
+            <Date>2018-01-20</Date>
+            <Version>4.18</Version>
             <Comment>Packaging update</Comment>
             <Name>Pierre-Yves</Name>
             <Email>pyu@riseup.net</Email>
         </Update>
     </History>
 </PISI>
\ No newline at end of file