fixed missing header, fixed install folder

ci/scripts/install.sh

@@ -8,12 +8,12 @@ if [ $# -ne 2 ]; then
 fi
 
 if [ ! -d "$1" ]; then
-    echo "Folder $1 does not exist."
+    echo "Build folder $1 does not exist."
     exit 1
 fi 
 
-if [ ! -d "$2" ]; then
-    echo "Folder $2 does not exist."
+if [ -d "$2" ]; then
+    echo "Install folder $2 already exists."
     exit 1
 fi 
 
@@ -21,6 +21,7 @@ BUILD_FOLDER="$1"
 INSTALL_FOLDER="$2"
 
 cd $BUILD_FOLDER
+touch $INSTALL_FOLDER
 make install
 export PYTHONPATH=$INSTALL_FOLDER
 python -c 'import hysop; print hysop'

src/hysop++/src/fft/fftw3.h

@@ -3,6 +3,7 @@
 #define HYSOP_FFTW3_H
 
 #include <complex>
+#include <stdexcept>
 #include <fftw3.h>
 
 #ifdef HAS_QUADMATHS