diff --git a/.travis.yml b/.travis.yml
index 300e1b0..a060e04 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -17,13 +17,12 @@ addons:
 
 env:
   matrix:
-#    - ZMQ_BUILD_TYPE=cmake DRAFT=enabled
-    - ZMQ_BUILD_TYPE=cmake ZMQ_VERSION=4.2.5
-    - ZMQ_BUILD_TYPE=pkgconf ZMQ_VERSION=4.2.0
+    - ZMQ_VERSION=4.2.5
+    - ZMQ_VERSION=4.2.4
 
 matrix:
   include:
-  # - env: ZMQ_BUILD_TYPE=cmake DO_CLANG_FORMAT_CHECK=1 CLANG_FORMAT=/usr/local/clang-5.0.0/bin/clang-format
+  # - env: BUILD_TYPE=cmake DO_CLANG_FORMAT_CHECK=1 CLANG_FORMAT=/usr/local/clang-5.0.0/bin/clang-format
     # os: linux
     # addons:
     # apt:
@@ -39,14 +38,14 @@ matrix:
           packages:
             - g++-7
       env:
-        - MATRIX_EVAL="CC=gcc-7 && CXX=g++-7" ZMQ_BUILD_TYPE=cmake ZMQ_VERSION=4.2.5 DRAFT=1
+        - MATRIX_EVAL="CC=gcc-7 && CXX=g++-7" ZMQ_VERSION=4.2.5 DRAFT=1
 
 sudo: required
 
 before_install:
   - pip install --user cpp-coveralls
 
-# Build and check this project according to the ZMQ_BUILD_TYPE
+# Build and check this project
 script:
   - eval "${MATRIX_EVAL}"
   - ./ci_build.sh
diff --git a/ci_build.sh b/ci_build.sh
index a383bf2..891fd1a 100755
--- a/ci_build.sh
+++ b/ci_build.sh
@@ -3,6 +3,9 @@
 set -x
 set -e
 
+LIBZMQ=${PWD}/libzmq-build
+CPPZMQ=${PWD}/cppzmq-build
+
 if [ "$DRAFT" = "1" ] ; then
     # if we enable drafts during the libzmq cmake build, the pkgconfig
     # data should set ZMQ_BUILD_DRAFT_API in dependent builds, but this
@@ -10,29 +13,15 @@ if [ "$DRAFT" = "1" ] ; then
     export ZEROMQ_CMAKE_FLAGS="-DENABLE_DRAFTS=ON"
 fi
 
-LIBZMQ=${PWD}/libzmq-build
-CPPZMQ=${PWD}/cppzmq-build
 install_zeromq() {
     curl -L https://github.com/zeromq/libzmq/archive/v${ZMQ_VERSION}.tar.gz \
       >zeromq.tar.gz
     tar -xvzf zeromq.tar.gz
-    if [ "${ZMQ_BUILD_TYPE}" = "cmake" ] ; then
-        cmake -Hlibzmq-${ZMQ_VERSION} -B${LIBZMQ} -DWITH_PERF_TOOL=OFF \
-                                                  -DZMQ_BUILD_TESTS=OFF \
-                                                  -DCMAKE_BUILD_TYPE=Release \
-                                                  ${ZEROMQ_CMAKE_FLAGS}
-        cmake --build ${LIBZMQ}
-    elif [ "${ZMQ_BUILD_TYPE}" = "pkgconf" ] ; then
-        pushd .
-        cd libzmq-${ZMQ_VERSION}
-        ./autogen.sh
-        ./configure
-        sudo make VERBOSE=1 -j5 install
-        popd
-    else
-        echo "Unsupported build type ${ZMQ_BUILD_TYPE}."
-        exit 1
-    fi
+    cmake -Hlibzmq-${ZMQ_VERSION} -B${LIBZMQ} -DWITH_PERF_TOOL=OFF \
+                                              -DZMQ_BUILD_TESTS=OFF \
+                                              -DCMAKE_BUILD_TYPE=Release \
+                                              ${ZEROMQ_CMAKE_FLAGS}
+    cmake --build ${LIBZMQ}
 }
 
 # build zeromq first
@@ -40,7 +29,6 @@ install_zeromq() {
 if [ "${ZMQ_VERSION}" != "" ] ; then install_zeromq ; fi
 
 # build cppzmq
-# for pkgconf ZMQ_BUILD_TYPE ZeroMQ_DIR is invalid but it should still work
 pushd .
 ZeroMQ_DIR=${LIBZMQ} cmake -H. -B${CPPZMQ} ${ZEROMQ_CMAKE_FLAGS}
 cmake --build ${CPPZMQ}