diff --git a/configure b/configure
index 646e7d0169..8f80161937 100755
--- a/configure
+++ b/configure
@@ -195,6 +195,7 @@ USE_PROFILE=0     # 0 = no profiling, 1 = C++ profiling, 2 = GLIBC profiling, 3
 USE_AMBERLIB=0    # 1 = Use AMBERHOME to fill in NetCDF/BLAS/LAPACK/ARPACK as needed
 BUILD_LIBS=0      # 1 = Means automatically say yes to building enabled libs when not present.
 BUILD_MPI=''      # If not empty, attempt to download and build specified mpi dist.
+icpp=0            # Used to count cmake_prefix_paths
 
 USE_SINGLEENSEMBLE=0 # Enable support for single ensemble trajectories
 USE_CPPTRAJDEBUG=0   # Enable internal cpptraj debug flags
@@ -2510,6 +2511,20 @@ EOF
 }
 
 #-------------------------------------------------------------------------------
+# Add cmake prefix path
+AddCmakePrefixPath() {
+  # Search for existing
+  for ((idx1=0; idx1 < $icpp; idx1++)) ; do
+    if [ "$1" = "${cmake_prefix_paths[$idx1]}" ] ; then
+      #echo DEBUG duplicate path $1
+      return 0
+    fi
+  done
+  #echo DEBUG add cmake prefix path $icpp $1
+  cmake_prefix_paths[$icpp]=$1
+  ((icpp++))
+}
+
 # Use cmake to configure build.
 SetupCmake() {
   CMAKE=`which cmake`
@@ -2584,6 +2599,35 @@ SetupCmake() {
   if [ $COMPILE_VERBOSE -eq 1 ] ; then
     cmake_options="$cmake_options -DCMAKE_VERBOSE_MAKEFILE=TRUE"
   fi
+  # Libraries
+  icpp=0
+  for ((idx=0; idx < $NLIB; idx++)) ; do
+    if [ "${LIB_STAT[$idx]}" = 'specified' ] ; then
+      #echo Lib $idx # DEBUG
+      AddCmakePrefixPath "${LIB_HOME[$idx]}"
+    fi
+  done
+  #if [ "${LIB_STAT[$LNETCDF]}" = 'specified' ] ; then
+  #  AddCmakePrefixPath "${LIB_HOME[$LNETCDF]}"
+  #fi
+  #if [ "${LIB_STAT[$LZIP]}" = 'specified' ] ; then
+  #  AddCmakePrefixPath "${LIB_HOME[$LZIP]}"
+  #fi
+  #if [ "${LIB_STAT[$LBZIP]}" = 'specified' ] ; then
+  #  AddCmakePrefixPath "${LIB_HOME[$LBZIP]}"
+  #fi
+
+  if [ $icpp -gt 0 ] ; then
+    cmppstring=""
+    for ((idx=0; idx < $icpp; idx++)) ; do
+      if [ ! -z "$cmppstring" ] ; then
+        cmppstring="$cmppstring;${cmake_prefix_paths[$idx]}"
+      else
+        cmppstring="${cmake_prefix_paths[$idx]}"
+      fi
+    done
+    cmake_options="$cmake_options -DCMAKE_PREFIX_PATH=$cmppstring"
+  fi  
   echo "  Cmake options: $WORKDIR $cmake_options"
   # Run cmake
   $CMAKE $WORKDIR $cmake_options
diff --git a/src/TextBlockBuffer.cpp b/src/TextBlockBuffer.cpp
index d44a4fdb1b..18b75f755c 100644
--- a/src/TextBlockBuffer.cpp
+++ b/src/TextBlockBuffer.cpp
@@ -68,7 +68,7 @@ int TextBlockBuffer::BlockToDoubles(double* darray) {
   {
     Line();
     char* ptr = BufferPosition();
-    if (*ptr == '\0' || ptr == 0) return (int)elt;
+    if (ptr == 0 || *ptr == '\0') return (int)elt;
     unsigned int nRemaining = Nelts_ - elt;
     unsigned int maxcol = std::min(Ncols_, nRemaining);
     // Loop over columns in line
diff --git a/src/Version.h b/src/Version.h
index ea107eca08..503351e627 100644
--- a/src/Version.h
+++ b/src/Version.h
@@ -12,7 +12,7 @@
  * Whenever a number that precedes <revision> is incremented, all subsequent
  * numbers should be reset to 0.
  */
-#define CPPTRAJ_INTERNAL_VERSION "V6.29.10"
+#define CPPTRAJ_INTERNAL_VERSION "V6.29.11"
 /// PYTRAJ relies on this
 #define CPPTRAJ_VERSION_STRING CPPTRAJ_INTERNAL_VERSION
 #endif
diff --git a/src/tng/CMakeLists.txt b/src/tng/CMakeLists.txt
index 80b18982b6..4b48a6f8b5 100644
--- a/src/tng/CMakeLists.txt
+++ b/src/tng/CMakeLists.txt
@@ -27,6 +27,10 @@ add_compile_options(${OPT_CFLAGS})
 add_library(tng_io STATIC ${TNG_IO_SOURCES})
 make_pic_if_needed(tng_io)
 target_include_directories(tng_io PUBLIC .)
+if(zlib_ENABLED)
+        include_directories(${ZLIB_INCLUDE_DIRS})
+endif()
+
 
 # checks based on tng_io's cmake script
 check_all_includes(C inttypes.h)